I suspect it was stolen and dumped by an ignorant burglar. It's there any way to identify from whom it came so I can return it? It seems pointless handing it into the police if they'll just destroy it....
1. 0.6 BTC at current price is still alot of money for many.
2. In my own personal point of view, I agree that it is pointless handing the paper wallet over to the police because...
3. If there is absolutely no means or clues available to you as a means of guessing who the real wallet owner might be, then I honestly do not think the police will find any clue either, since they are not super humans.
Here is what I think you should do - - since you have access to the wallet now, I will suggest you try moving the funds to another wallet, if the operation go through successfully, then pay absolute attention to this forum to see if any user is going to complain about a wallet hack, incase there is, you can then try to match the wallet details provided by the user to that which you have at hand, if it matched, then maybe you now know who the owner of the paper wallet is.
But the above can only work if the real owner of the paper wallet is on this forum and currently active.