Hmm, how much is it bent? It's hard to tell from your picture. Care to put a ruler nearby it?
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Anyway, yes ABS does have a somewhat large elastic range. It' IS a polymer, so it's what you'd expect. I'd say your only hope of deforming it plastically (where it'll bend back and stay that way) is to take it apart, and try.
Really, the only other thing I can recommend is to contact the seller about a return (then buy a WASD)