If the person you bought said it worked, that was pretty clearly a lie. If the card was listed through craigslist, there would be a paper trail about shape of the card, did the listing say "as is"? Even if it was, he said it worked, when it did not. While the police likely won't care much to help out in this case, you have his contact number, tell him you will contact them and say you are trying to pass of broken goods as working and is basically stealing, say you will call the local police and will ask if you can do anything about it through them. Most likely you will get your stuff back.