Some people say "finders keepers" once they find something like say the Iceman, but finders keepers doesn't really mean anything to you unless your a scientist, I have learned as myself that once you find something that you like, you just quickly throw it away hidden somewhere. But the Iceman? Heck, I have no Idea where to put him. Well, Iceman should be kept in museums because where would the owners put their things? A grave? A box? A glass case? Where? Well museums pretty much have everything in their hands once they find something that is cool and old. Another thing about it is that they can use it again to find other different things or make a replica and put it in a basement so that no one can steal it. Museums also keep them because of their profit and attract tourists and earn some money from the tourists. Think of the Iceman... If the owner was you where would you place it? Think deep... If there's no place to put it, you can just sell it to your local museum and earn as much as it costs. Also, scientists can also understand how or why he died, I'm pretty sure that they have a lot more questions or hypothesis out there... Owners, however, just don't know what to do with them.
Then there's the downside, since there can only be one artifact, the tourist has to pay thousands or hundreds of dollars to go to that museum and see that one artifact and then paying the entrance fee's and such. Unless your a rich person, you can pay those hotels, flights and the entrance like you just busted through the museum wall. Well, that is Illegal and counts as a fine for breaking a wall.
Then there's the downside, since there can only be one artifact, the tourist has to pay thousands or hundreds of dollars to go to that museum and see that one artifact and then paying the entrance fee's and such. Unless your a rich person, you can pay those hotels, flights and the entrance like you just busted through the museum wall. Well, that is Illegal and counts as a fine for breaking a wall.