Mik,
I'm pretty sure some of them were kosher, it was the fact that he had multiples, on different labels (and without labels) of the same tracks.
The Helpless he offered me was on a 7" acetate without a label, yours is/was on a 10" - why would a studio cut the same track on different size discs?
Then there were the "Tastes Sour Don't It" acetates, that had labels stuck on over the top of other labels (which was suspect in itself).
Cheers,
Joe.