I would just give the plod his details, and everything. If he was not aware it was stolen (maybe it was a gift) then he has nowt to worry about. You need to cover your own back before you worry about him or the money, and as said chances are if it goes to court you'll easily get your money back especially since you payed with paypal. I wouldn't name and shame in this case, just tell Petrucci. Then futher sales can be kept an eye on.