It wasn't my intent to get all legalese. I just wanted to point out that, if you were in a movie theater, a cocktail lounge or a grocery store and a situation similar to yours happened, most people would expect the business to make it up to the customer in some way.
As a matter of fact, I think most good businessmen would offer these things to the customer without being asked, simply out of good faith.
I would not go in with guns a-blazing but it is certainly within your right to ask for "a little something" to make up for it if you are polite about it.
The finder or the Polaroid back would be a fair offer if you ask me. If I had my pick, I think I'd ask for the finder.