From what I know, definitely not off of an A10. Body too short, ears too triangular, slots too slotty (holes-only for A10). I don't think they are A50 or A65 (shorter than A10, slot on one side, but still had curvy ears). Regarding the tabs? Maybe they were cut off due to damage. That's where my expertise (word loosely applied) ends. Maybe they are off some much later BSA single or not BSA at all. I won't be offended when someone chimes in to give more complete info, or, for that matter, more correct info.
If it was me, I would try to get my money back.
Cheers (Not just a bar in Boston.)