I just looked through this discography:
https://www.soulfulkindamusic.net/verve.htm
I didn't really see any soul titles that appeared to be ultra-rare. Is it really just the we the people 45? Obviously I didn't know a lot of the titles, which I assumed to be rock. Also, I don't understand how the discography has numbers that are marked as unreleased and other numbers that have question marks. If someone got access to the company files, they would know that certain items are unreleased, but wouldn't they know the missing numbers? How else would they know certain items are unreleased?
Anyways, it is weird about there just being one rare soul title.