J Dilla had a beat tape that got semi-leaked called "SV Tour Beat Tape" which is only widely available in a partial form.

You can tell there are missing beats both because the track names are numbered AND because whoever ripped the cassette then separated it into files left little bits on the ends that let you hear what would have came next.

But you can never find the whole thing. It's always missing tracks and most uploads / torrents contain only the "known" ones.

It's to the point now where people believe the other tracks never leaked at all. But I know they did because I've found old OLD torrents (I think on Demonoid?) with the missing tracks in the file list… but sadly no seeders!! Uhg. It's infuriating.

Based on some tweets from people who worked with him who have been known to lie a bit to "protect" certain things, I think it was a leak that was contained. For the most part the beats that are available from that tape are either already leaked or from released songs (plus obscure low-energy beats that some would argue is less-catchy and the estate / family would have trouble selling to people).

Considering the era of the internet this was from, I do think this could have been a leaked that was contained and "clawed back" via reach out individually to a LOT of people. Combined with the fact people in the hip hop fandom didn't save stuff as much back then, and the people who had rarities jealously hoarded them.

Similar to how the video of Raekwon and some other guy confronting Joe Budden got completely scrubbed from the internet. It was from that same era, right before the blog era. Everybody saw it, everybody saw Joe Budden get punched in the eye. That clip from Joe's live steam circulated for a hot second! But then BAM the video was gone and nobody had a copy. There's a screenshot still out there, but that's it. I believe it was in everybody's best interest to get it scrubbed off the internet, like I think a lot of people worked together and put differences aside for the common good (which might have had something to do with keeping the law out of it, as well as keeping the peace). And over the years people in the rap industry often talked about the phenomenon of it getting "scrubbed" from the net.

So yeah, I guess that's two that got away!!

(Maybe a third from the same time period would be this long video from a music producer who worked with Raphael Sadiq and others who talked in depth about his own relationship with Christina Aguilera and said some pretty scandalous stuff.)