I wonder how many people returning lost goods actually claim the 5-20% they're entitled to. I lost my bag once (with my wallet in it). I went to the police box closest to the area where I'd lost it, and of course they had it. Someone had picked it up and turned it in. The officer I talked to explained to me that the finder was entitled to a percentage, but had checked a box on the form waiving the finder's fee.

And to be honest, I don't think I'd claim anything either if I turned in someone's wallet.