I can't believe how much cash you all seem to be hoarding or finding - this must be a big help with Christmas coming! It does make me wonder, though, how much money is lost to its rightful owners and kept by people who have no entitlement to it (but may not know where to return it to). I do keep a little stash, maybe £50 - £100, hidden away, but I have told my two daughters where it is, so that if I die or lose my marbles, they won't accidentally get rid of the item in which the cash is hidden.
We were once out for a walk with the family, on a footpath a mile or so from a town. My granddaughter, running ahead, found a pile of notes -I think it was about £80 - just lying by the side of the path. There was no one in sight, so we took the money to the police station (setting a good example to the kids!). It was never claimed, so it was returned to the family, who had a day out at an adventure park with it.