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.
The owner may have reported the missing wallet to the police. That's official the go-to place for missing items.
if you are concentrating on the zippy bag point you missed the point. it was the BITNOTE that was more interesting.
OP's description doesn't sound like a "bitnote":
There is faint remnants of a bitcoin logo on it and the words 'paper wallet' and the name of the website from which it came printed down the right hand side.