The aide told Epstein that he planned to hide them in tissue boxes at the house.
The emails were among millions of documents released by the US Department of Justice (DoJ) last month.
In an email on 5 February 2014, Epstein instructed the associate: "Let's get three motion detected hidden cameras, that record, thanks." (sic)
Five hours later, he received a reply: "Jeffrey, I already two purchased the Motion sensor camera from the Spy Store in fort Lauderdale yesterday, I charged them last night and figuring our (sic) how to work them as we speak … I'm installing them into Kleenex boxes now."
The Sky News Data & Forensics team has been reviewing more than a thousand fragmented videos released by the DoJ.
Many of them appear to have been filmed in Epstein's office at his Florida home.
One surveillance video we found shows a man, who appears to be Epstein, speaking to women in that room.
Another shows a woman kneeling next to him.
Sky News is unable to confirm when the footage on the office cameras was filmed.
We know from police documents that victims feared they were being secretly recorded.
These newly uncovered emails and images analysed by Sky News suggest that was indeed the case.
US attorney general accused of 'lacking empathy'
It comes after Donald Trump's attorney general Pam Bondi clashed repeatedly with critics during a lengthy committee hearing earlier this week.
On Wednesday, Ms Bondi gave her first sworn testimony since the release of the Epstein files, which at times descended into a shouting match with Democrats.
Epstein survivors later accused her of lacking empathy and humanity, while critics claimed that because not all documents have been released, and many have been heavily redacted, some powerful figures are still being protected.
Read more from Sky News:
FBI releases new details about suspect in disappearance of US TV host's mother
Donald Trump agrees to end ICE operation in Minnesota
Ms Bondi - who as head of the DoJ is ultimately in charge of the files' release - defended the way the process had been handled and said she was "deeply sorry for what any victim has been through, especially as a result of that monster".
However, the US attorney general refused to take personal responsibility for initial failures to hide the names of some victims in the files and said staff had done their best under pressure.
The BNP won a two-thirds majority, enough to form the next government and bring the potential for stability following the ousting of former prime minister Sheikh Hasina.
The BNP is headed by Tarique Rahman, its prime ministerial candidate, who returned to Bangladesh in December after 17 years in self-exile in London.
The 60-year-old is the son of former prime minister Khaleda Zia, who died in December.
Read more:
Analysis - An era-defining election for Bangladesh
The vote, which was largely seen as a two-way contest between the BNP and an 11-party alliance led by the Islamist Jamaat-e-Islami, took place on Thursday amid tight security and concerns of democratic backsliding and rising political violence.
A clear outcome in the vote was widely seen as crucial for restoring political stability in the Muslim-majority country of 175 million people.
The bloody student-led revolt of July 2024, which the UN estimates resulted in the deaths of 1,400 people, led to the downfall of Hasina, sending her to exile in India.
Hasina's Awami League party has since been banned from all political activities, while an interim government led by Muhammad Yunus, a Nobel Peace Prize laureate, has been in place since her ousting.
Alongside the election, people were also taking part in a referendum on changes to the constitution, including the introduction of a two-term limit for the prime minister and increasing women's representation.
Bangladesh's parliament has 350 seats, with 300 of those elected directly from single-member constituencies and 50 reserved for women.
The BNP, seen as the frontrunner in the election, was founded by Mr Rahman's father, Ziaur Rahman, in 1978.
For much of the past two decades, the party has been in opposition to the Awami League, boycotting several elections and accusing Hasina's government of systematic vote rigging and political repression.
Mr Rahman's self-imposed exile to the UK came after Hasina's government pursued multiple corruption and criminal cases against him - charges which he has denied.
The cases were dropped after Hasina's government collapsed, paving the way for his return to the country.
Read more from Sky News:
Epstein asked staff to install hidden video cameras at Florida home, emails show
Defend yourselves and don't rely on the US, official tells Europe
The BNP's victory prompted messages of support from the leaders of other nations in the region.
India's prime minister Narendra Modi said: "India will continue to stand in support of a democratic, progressive and inclusive Bangladesh."
Asif Ali Zardari, the Pakistan president, congratulated the BNP on a "landslide victory" and "the people of Bangladesh on their successful, peaceful polls".
Mr Zardari added that Pakistan "reaffirms strong support for democratic partnership and shared progress ahead".
The FBI also shared new identifying details about a possible suspect seen in images and video the bureau previously released showing a masked individual on the porch of the 84-year-old's home in Tucson, Arizona, shortly before she went missing in the early hours of 1 February.
In a statement, FBI Phoenix described the person as "male, approximately 5ft 9in-5ft 10in tall, with an average build" and said he can be seen wearing "a black, 25-liter 'Ozark Trail Hiker Pack' backpack" in the footage shared by law enforcement.
Read more:
Nancy Guthrie: What we know so far
The FBI also said it is increasing its reward up to $100,000 (£73,400) for information leading to the location of Ms Guthrie, who police believe was taken against her will.
The reward, which was previously up to $50,000 (£36,700), also applies to information that leads to the arrest and conviction of anyone involved in her disappearance.
Over 13,000 tips from the public have been received since 1 February, according to the FBI.
Earlier this week, a man was detained for questioning in the investigation and released without charge, authorities said.
Speaking to reporters following his release, Carlos Palazuelos, who had been detained during a traffic stop, said he was innocent and did not know who Savannah Guthrie was.
Police said Nancy Guthrie has difficulty walking, has a pacemaker, and requires daily medication for a heart condition.
On Thursday, Savannah Guthrie, who co-hosts the Today show, posted on social media a home video montage of her mother with the caption: "Our lovely mom. We will never give up on her. Thank you for your prayers and hope".
Read more from Sky News:
Donald Trump agrees to end ICE operation in Minnesota
Katie Holmes pays tribute to Dawson's Creek co-star
The Guthrie family previously said they were willing to pay for their mother's return after an apparent ransom note asked for $6m (£4.4m) by last Monday.
The FBI said on Monday it was not aware of ongoing communication between Nancy Guthrie's family and the suspected kidnappers.
The former Labour cabinet minister told our political editor Beth Rigby on the Electoral Dysfunction podcast that the work so far to tackle it is "just not good enough", and women's voices need to be respected in government.
Her comments come after the most difficult week of Sir Keir's premiership that saw him fighting for his political future.
Two of his closest advisers, as well as the nation's most senior civil servant, have left Downing Street in less than a week as he has sought to regain control.
👉 Click here to listen to Electoral Dysfunction on your podcast app 👈
The fallout from Peter Mandelson's appointment as US ambassador, as well as the revelation that the prime minister knew his former communications chief, Matthew Doyle, had an association with a convicted paedophile before nominating him to the House of Lords, saw Sir Keir accused of prioritising a "boys club" culture over the views and experiences of women.
For the first time since taking office in July 2024, he addressed a meeting of the Women's Parliamentary Labour Party in which he promised that culture change in his government is coming.
Speaking on the Electoral Dysfunction podcast, Baroness Harman said he needed to go much further in making tackling misogyny a priority of his government, suggesting that he make it the sixth headline aim of his administration, alongside economic growth, expanding clean energy, fixing the NHS, making the streets safe, and breaking down opportunity barriers.
She told Beth Rigby: "I suggested that - you know, Keir Starmer has got these five missions - that we make a sixth mission of actually sorting out misogyny and culture change.
"And I think that there is a recognition now that it's not just good enough to - sometimes people have said, 'Keir has said something on one day, and then he is moved on to something else on the following days' - and certainly there's a lot going on, but this has got to be seen through."
Women 'not part of the decision-making'
The senior Labour peer also argued that Lord Mandelson would not have been made the UK's ambassador to the US if a woman had been in the room, given his known links to convicted paedophile Jeffrey Epstein.
"It wouldn't have been set aside as something that could be brushed past and then just crack on with the appointment," she said.
"The problem about misogyny is not just the discrimination that's meted out to women around and about, but it's also you make bad decisions because you've only got one view in the room - men's views - and they don't cognise issues in the way."
Baroness Harman also said the phrase "in the room" is "quite bad" because more senior men will make a decision, and then point to the more junior women to be able to say, "see, there's a woman in the room".
"Well, she is in the room, but she's not part of the decision-making," she continued.
"Actually it's about partnership in decision-making. And that's what they've got to aim for - not just to get women in positions, not just to get women in the room, but to have real equality of decision-making and respect for what women need to contribute for the government to actually get itself on track."
Inquiry needed into 'UK's Epstein'
Former Scottish Conservative leader Ruth Davidson also noted that the women abused by rich and powerful men have not seen justice done.
Baroness Harman echoed former prime minister Gordon Brown's call for the police in the UK to investigate the trafficking of women, and called for a "proper public inquiry" into the more than 400 allegations of sexual misconduct against the now deceased former Harrods boss Mohamed al Fayed.
She said: "I met on Tuesday this week with some of the victims of al Fayed, and they were saying [that] to see on television minister after minister, everybody's saying, 'we've got in the forefront of our mind these women and girls, the ones that are in America', and they were saying, but what about us? What about your own Epstein, which is al Fayed?"
There also needs to be "a total feminist reset of Number 10", and a female first secretary of state (most senior cabinet minister below the prime minister) to "drive forward culture change across government", Baroness Harman concluded.
My eldest daughter was six at the time, her twin sisters nearly three. They didn't have their own devices - Instagram, Snapchat and YouTube were beyond their imagination.
TikTok hadn't even been invented.
Yet now as teenagers their lives, like pretty much every other child we know, are dominated by social media. Snapchat is central to their social lives and TikTok is a go-to dopamine fix.
As parents we try our best to pry the devices out of their hands and limit their screen time. No surprise the idea of a government-mandated ban is popular with parents, less so with kids.
"We've been born into a world with social media so it's a bit unfair if you just take it away from people who are younger," said one of my 13-year-olds. Especially, she adds, "when they're influenced by adults who are also on their phones."
Fair point. But we've just about had enough of arguing with them about it.
Now it looks like we've reached a point where the majority of people are starting to think the same.
France and Spain are promising laws to ban child access to social media as early as this year.
Austria, the Czech Republic, Denmark, Finland, Greece, Italy and Slovenia have proposed similar legislation.
Read more:
The challenges I face keeping my kids safe in the new Wild West
Do you know what your kids see online?
Instagram and YouTube 'engineer addiction'
Portugal is considering parental consent for child social media access. Last month the Westminster government said it would consult on the issue of social media for the under-16s.
As a bloc, the EU has said it supports a Europe-wide ban.
A tipping point?
So, have we finally reached a tipping point where social media companies will be forced to amend their products?
"We knew cigarettes were harmful and addictive and kill people for decades before we actually got legislation that made a difference," said Clare Melford, chief executive of the Global Disinformation Index.
"Social-media companies have only been around for 15, 20 years. So it is relatively quick on a historical scale, but for those of us who have teenagers now, it's not quick enough."
White House backs Big Tech
A Big Tech-backing White House isn't helping. US secretary of state Marco Rubio in December banned Ms Melford and three other European online safety campaigners from entering the US.
Another, a legal resident in New York, was threatened with deportation.
"I wasn't surprised because we know the impact of Big Tech and big money on government in America and around the world," said Imran Ahmed, the British boss of US-based Centre for Countering Digital Hate (CCDH).
"But of course, it was shocking as a family to be threatened with potential detention just for the things I said."
Tech bros fight back
The tech bros are fighting back too. Elon Musk has been a target of European ire over allegedly extremist content on his platform and his Grok AI's (now curtailed) "nudification" powers.
When Spain's Prime Minister Pedro Sanchez announced his social media ban earlier this month, Musk hit out.
"Dirty Sanchez," he posted on X, the platform he owns. It is Mr Sanchez, not he, who is "the true fascist totalitarian" as well as "a tyrant and traitor to the people of Spain".
But it would be wrong to think the White House and social media firms are in step with wider US public opinion.
US states back child social media bans
American parents are angry too and their elected representatives know it.
US states, like Mr Rubio's Florida, have backed child social media bans. Regulations to protect kids online are gaining traction and rare bipartisan support in Congress.
In the absence of hope for federal restrictions, court cases, like one under way in California this week, centring on the "addictiveness" of apps, are also putting pressure on social media platforms.
If successful, it may even force them to amend their offerings to children.
"From my perspective... we are further along in that battle than we ever have been," said Mr Ahmed from the CCDH.
"I think that ultimately we will be able to renegotiate the toxic relationship that we have with tech, where they are exploiting rather than enriching our kids."
It now looks like public opinion will ultimately force Big Tech to make social media a safer, better place for children.
But given the industry's deep pockets and influence, I'm expecting to be arguing with my kids about their screens for a while yet.