lol!! grrrr i dont know what to do with the snare. keep it and ignore the out of round-ness? maybe try get it fixed? no idea how i'd go about that, sell it on for half the money i payed? :(
Welcome! I hate to hear of this sort of thing, but since it came from a more than likely "reputable source", why don't you contact the studio and explain to them your finding. First of all, the out of round will cause issues for ever. Second, if you don't like the drum, get the documentation and move it on, through ebay or CraigsList and let the next owner deal with it. If, on the other hand you bought it through ebay, send it back and get a full refund by claiming SNAD (Significantly Not As Described). Since this drum is from a studio that has a reputation to maintain, I would be almost assured they would want to keep from public harassment.
If you do end up keeping this snare, you should take a fine sandpaper and knock the flaking off the bearing edges so that it won't cut your new heads. Sometimes these drums flake and the only way you can keep them from cutting heads is to sand the affected area.
Good Luck with her. At least try contacting the seller and explain to them your situation and that you would like your money back. The reason they sold the drum in the first place was because they could no longer make it sound good, so they likely knew it was screwed up. And likely know exactly how it happened. More than likely it was dropped and bent.
BTW, the only Supra with crimped beds would be a chrome over brass, and they do warp and become distorted much easier than the aluminum alloy shells.