Oh I am sure I will dig up some more in time.
On a non-gaming but lost media related note, my brothers and I managed to help resurrect the last two seasons of the 2000s Canadian animated comedy Odd Job Jack by uploading some screencasts we had to the Internet Archive, which we did not realize had become "lost media" in the meantime.
https://lostmediawiki.com/Odd_Job_Jack_(partially_lost_Comedy_Channel_animated_sitcom;_2003-2007)
Not quite sure it counts, since I am fairly sure the original studio still have copies (and are still in business, most recently on Corner Gas Animated), but they are lost to the public it seems, as is still most of season one in English at least.