If you know you are buying stolen goods, then yes, you are commiting a crime by doing so. However, If you obtain the goods in a good faith transaction (not out of the back of an unmarked white van), then the property becomes yours. All you can do is try to get the money out of the guy that sold it. Sorry, I cant find the relevant quote in my handy 100 dollar copy of west's business law that the bookstore wouldnt buy back.

Sean