Posthuman Blues

'007 spy suit' found in Nasa bunker

"Space historians are trying to find out who the mystery man is after his spacesuit turned up, along with an identical outfit bearing number 008, in an abandoned space agency (Nasa) blockhouse last used to launch Alan Shepard and Gus Grissom into space in 1961."

This sounds like a discarded premise from J. G. Ballard's "Memories of the Space Age."