I've been mulling over this subject for a good while and while warehouses/preservation are definitely more of a priority than they were back in the day I do know there's stuff that'll probably never get recovered considering this engine has been around for a dog's age. There's also things that were archived but for whatever reason it's an older version, with newer ones being gone. Was wondering what particularly famous examples are out there, since I'm just genuinely curious.Keep in mind I mean actual publicly released stuff. No private junk or things of that nature.
At the top of my head, I think Ahuron's Goh-un's AI Patch by lijide.That thing is far gone in history and is likely lost due to time's wonders.