>Anything found becomes property of the state, and is placed in the custody of the museum.

And this often leads to the exact opposite of what the museum wants: The people will then either keep it or they will sell it on the black market, when they know, that maybe there's some kind of problems and punishments by the law.

I think, the state and museum should pay the guy that finds something and turns it in, rather than punish him. We are talking about very rare historical artifacts sometimes, some collectors are paying a lot for certain things.

Like in my country, a guy found an original dagger from the Roman Empire, dated around 15 BC. I'd like to have such a dagger in my collection and i'd pay a lot for it.