Case in point was the following sign which we noticed at the noticeboard at the entrance to our building. Someone had found an earring and did not only not just take it, they went through the trouble of creating a sign and attaching the earring to the sign so the person who has lost the earring can easily find it back.
The sign reads "who has lost this?"
The same honesty applies when you leave your bag or suitcase sitting somewhere - you typically do not have to worry about someone taking it.