Recently in Pattaya, I found a motorbike key on a ring with a couple of others lying on the pavement next to a few parked motorbikes. I picked it up and gave it to a vendor at the side of the pavement and asked her to watch for someone looking for the keys.
Supposing it had been a wallet with a good few thousand Baht in it and no identification, if you found that would would you do? Hand it in to the police?? Of course that would be fine in a western country, but in Thailand????