I presume you are referring to the KV Share.
I have done a search on 'Seal' as you suggested on both the source material as well as the MEGA share, and I can only see probably 7 actual dupes with different codes for the same tracks (Some sort of private coding, the download code - which by the way is traceable by RECISIO! - and the catalogue code). In that search, several of the tracks are in three different formats, Non-vocal, with backing vocals, and with guide tracks, and one case of KV releasing a re-recorded version (upgrade if you will).
Also in that search I got tracks from Seals and Crofts, Dan Seals, Brady Seals, even things like 'Sealed with a Kiss', and all those only amounted to 129 entries for over 2Tb of storage...
My post was a collection of my own tracks, tracks on a laptop I purchased from a retiring KJ, and mirrored tracks from other posts on here, so I am not suprised there are a few duplicates.
I am gradually sorting through all my tracks, and where I can identify duplicates, I am whittling them down. Unfortunately i have yet to find a decent duplicate file finder that uses AI to 'listen' to each track, rather than just comparing Title, File Size or CRC checksums.