In one video, officers ask Mangione to lower the face mask he was wearing to hide his identity.
"That's 100 per cent him," one officer says eagerly as they step outside to speak out of Mangione's earshot.
"I told you, man," another responds off camera.
Later, an officer searches Mangione's belongings and smiles widely as she pulls out a gun cartridge, seemingly confirming they'd found their suspect.
The trove of videos comes from Mangione's December 9, 2024, arrest in Altoona, five days after Thompson, a 50-year-old Minnesota executive, was gunned down as he walked to a midtown Manhattan hotel for his company's annual investor conference.
A Manhattan judge unsealed the recordings Friday after CNN petitioned for their release.
Parts of the videos were shown during a December court hearing as Mangione's lawyers unsuccessfully sought to get key evidence thrown out, including his initial statements to police and items seized at the time of his arrest.
Mangione pleaded guilty in August to federal stalking charges and faces life in prison when he's sentenced in December.
He also faces murder charges in New York state court, though those proceedings have been postponed indefinitely as his lawyers seek to have the case thrown out.
