Very nice! I have never tried to complete that set as they are very tough to find. As a matter of fact all the inserts from those very early Topps basketball seem to be very tough to find. I know on the 1971-72 sticker set, that the ones I have are mostly the ABA ones as I am very nostalgic about the ABA. Man, I miss that league as well as the old AFL. Throw in the black borders on that set and that is a very nice pickup for you.
Are there 3 ABA stickers that are more rare than the others? If so, which ones are you talking about. Also do you know what that set books for? I have no idea on that as it never shows up in the Beckett's Plus guides and my basketball annual is ancient.
Boots, I have no idea about that backwars, wrong way jersey thing. The one thing it may be is some kind of copyright deal where the card company could not show the official team logos. A lot of 1960s football sets have all the logos on the helmets airbrushed out because of that so maybe Topps just asked the players to wear their jerseys insdie out so collectors could at least see the color schemes for the various teams.
This topic probably should have gone in the card talk room but it is no big deal that it was put here. Congrats again on that very NIIIIIIICE acquisition!!