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 already. That's official the go-to place for missing items.
You are right, but I highly doubt anyone would think of reporting this kind of matter to the police, except in the occasion that the user was robbed and many items, including the paper wallet was taken from such a person, then no doubt, the matter can be reported to the police, but in an occasion where the user was just walking by the side of a beach and wanting to bring out his or her phone from the pocket where the paper wallet is, eventually, the paper wallet fell off without the user taking notice, I personally would not report such a case to the police since....
1. I don't think the police will go in search of the paper wallet for me.
2. If someone picked my lost paper wallet, I am not expecting that person to bring it to the police.
3. Even if the picker turned out to be a good Samaritan by handing over my lost paper wallet to the police, I don't find the police trustworthy enough to call me up to let me know that my lost paper wallet have been found, the police are likely to keep the wallet for themselves.
Though I understand that police differs from country to country, but the fact that there are many countries in this world that their police are more corrupt than the citizens, this can never be over emphasized.