Argonaut had pre-production versions of several Amiga games and they were just thrown in the skip when we moved offices. You have to realise that most games companies are very forward looking places. They have no time for nostalgia and never thought that someone might like this work. They just got thrown into a skip and they never looked back.
For me the thing I regret the most was I personally fed lots of the CDR discs into the shredder including 10's of different beta versions of the unreleased Atari Jaguar CD game "Creature Shock". But I had no idea of the significance.
At least I saved StarFox 2