A tape containing UNIX V4 was discovered!

[RetroComputingCollector]

Unix V4: Only known copy may lurk on recently unearthed tape

: It might have the first-ever version of UNIX written in C

www.theregister.com

The University of Utah had a tape labeled as a complete copy of UNIX V4 (which was lost media until now). Hopefully the CHM can manage to dump it.

 

[Micski]

The original chess game, that is supposed to be in /usr/games/chess, might be restored in future releases.