I saw this and others from the Perception / Today vaults announced on Dusty Groove and my first thought was that when DJ Spinna did the compliation pictured in Rooster_Ties' post above, he said the tapes were missing. I did some digging and found the source https://www.villagevoice.com/2012/05/11/qa-dj-spinna-on-perception-records-new-york-soul-in-the-70s-and-why-a-tribe-called-quest-sampled-submission-better-than-anyone/
Here's the relevant passage: "they weren’t a label that I can say people really knew much about. There’s definitely a lot of mystery surrounding the label because there’s no tapes, no multi-tracks or masters. Everything on the compilation for the most part came off of records, so something happened somewhere. I don’t know if the [pressing] plant burnt down or something like that, but something happened"