if we find money at work on the customer side we have to hand it in and record the find, in self service tills any money left remains the property of the store, if unclaimed it is donated to the company charity.
I once found a florin in the street when i was about 10, i was on the way to school, i called at the post office and bought sweets, it was the most amazing find and i have always remebered it, for the next 8 years i always looked at the same place when i walked past and expected to find more!