If Cleanliness is Next to Godliness, What is Honesty?

In a rare recent act of generosity I just handed in a £20 note I found on the floor at work to reception. They appear to have an honest policy for dealing with it and if noone claims it within three months I get it. It's not like I couldn't have done with it, but I'm sure someone else in the same situation has just lost it. Here's hoping it wasn't one of the legions of drug dealers around there parts...