Hi sup_fan, please take a look at my post above - I think I have all of those you listed that were not issued except the Supremes' titles "Around the World" and "Some Things You Never...".
739 was the Sterling Ball Benefit. That album was issued and given to attendees of the ball as a special souvenir but not made available commercially. It was a compilation of already-released tracks made for a specific purpose, not really a cancelled project.
Others you listed were definitely released, though the catalogue number changed between planning and release [[eg Jackie Jackson from 757 to 785).
M-785V1 - Jackie Jackson - Jackie Jackson [[1973)
T8-370M1 - Givin' All My Love - Tata Vega [[1980)
6002TL2 - Stevie Wonder's Original Musiquarium [[1982)
6001TL - Yes It's You Lady - Smokey Robinson [[1982)
Marvin Gaye at the Copa did have a number [[273) but was not issued until Hip-O Select released it on cd in 2005. I also listed it above.
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