I had to giggle tonight: in a company where I go to give regular lessons, someone has lost two one-yen coins. Someone else found these two coins, a couple of weeks ago and went to the trouble of finding a plastic bag and putting the coins into it, and then pinning it to a notice board for the owner to take back. I've a feeling it'll be there for a long time.
Two-yen is less than one-pence!
(Well, it's amusing ME).