OK, my note is off-topic but related and maybe useful. Discogs has a bug when it comes to label's discographies, some releases arent displayed in the list although they are on Discogs. It's months like this ! And every now and then i notice they still haven't fixed it. Cant remember when it was last time, but not long ago.
On topic : Yes, forgotten / rare / lost stuff fascinates me too. Even if the music in it isnt top notch, it has an aura, a charm. Cant explain it. Maybe more as an object ? I probably have the only one remaining.
I cant bring names to memory now. But many times i see old tape labels with 2-3 releases known in the database, which all of them are interesting, and catalog numbers that indicate that many releases are not listed, are missing, forgotten. Makes me wonder. This is mostly a case of 90s labels, than 80s. Strange enough.
Edit : example :
https://www.discogs.com/label/55175-B-Gore-Records . Catalog number up to 45, Discogs lists 25. Not sure if anything more is listed on Discogs and not displayed cause of the bug.
Edit 2 :
https://www.discogs.com/forum/thread/1134380 , maybe fixed now ?