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Found this multimedia:
I don't know if it has been discussed here on ATS.
 

Lost Cosmonauts Sound Clips

• I cosmonauti perduti (The Lost Cosmonauts) - Focus.It
• Lost Cosmonauts Sound Clips - Focus.It - (SWF)(Archived)
• Lost Cosmonauts Official Site
• Notes on the space tracking activities and sensational claims made by the Judica-Cordiglia brothers
• July 2008 - Lost in Space - What really happened to Russia's missing cosmonauts? An incredible tale of space hacking, espionage and death in the lonely reaches of space. By Kris Hollington for the Fortean Times - (Archived)
• 'Space Hackers' – an intriguing documentary - Southgate Amateur Radio Club

• An analysis of the flight of Vostok - by Sven Grahn
• Spectrogram of signals from Explorer 1 - by Sven Grahn
• Project Mercury Manuals - Meadville Space Center
• Oberg, James, "Phantoms of space", Part 1 and Part 2

Are these audio files available from some other source to verify they have not been faked?

Copernicus, you're right. I apologize to have not provided other sources, so far.
This case has been discussed in the past, maybe not here.
This link should be useful...
Notes on the space tracking activities and sensational claims made by the Judica-Cordiglia brothers - (Archived)

'Space Hackers' – an intriguing documentary

Two young Italian amateur radio enthusiasts eaves-dropped on top secret space transmissions and in doing so lifted the lid on the race to space.

The brothers Achille and Giovanbattista Judica-Cordiglia had their passions ignited by tuning into Sputnik 1 in 1957.
They were also keen home movie buffs and captured their exploits on film.

With home built equipment they monitored both the Soviets and the Americans as they explored space. Their activities did anger authorities behind the Iron Curtain. At one time Radio Moscow branded the pair as ‘space gangsters’ after they exposed failures of early space flights.

Their extensive archive of audio recordings includes that of a human heart-beat and laboured breathing from space in 1961, which an Italian cardiologist diagnosed as being from a dying man. On another occasion cosmonauts were heard
experiencing enormous heat, and then abrupt silence, another failed space mission.

The boys entered an Italian television quiz show with the topic of space and won easily. With the cash prize they bought tickets and headed to the United States.

NASA officials were initially in disbelief when the brothers played their tape recording of Astronaut John Glenn from space, but soon recognised their talent that led to collaborative efforts.

The documentary, Space Hackers, depicts amateur radio’s spirit of experimentation which includes orbit predictions, coping with Doppler frequency shift, extensive antenna design and construction.

Jim Linton VK3PC
VK1WIA.

SOURCE:
http://www.southgatearc.org/news/july2008/space_hackers.htm

The Southgate Amateur Radio Club has discovered the video posted on YouTube... 
Update... YouTube video removed for terms of use violation