Ouch! Horrible stories. I too would always hand in a valuable find to the police.
Deedaa's story of the cat reminded me of when a fairly near neighbour turned up at my house looking for her cat. I said I'd not seen it and had to stop her searching my house. She told me it never left her house and was valuable.
I took her phone number
The following day my DD heard a strange noise and a strange animal, skinny with pointy ears and big eyes shot past her on the landing .
I checked the attic but found nothing but wondered if it could be that cat
I put food and water in the attic and shut the door. Next morning I checked again, nothing
I called the number and a man said he'd come round
2 hours later, the woman came up with a cat holder. I showed her the attic and she came back down carrying the strange animal. It was bald and striped. Not a word of thanks or anything.
People are strange.