I mean you can think whatever you want, fact is there is clear difference between stealing and finding something.
There is a clear difference between stealing and finding something
which you then give back to its rightful owner. There is much less of a difference between stealing and finding something which you then keep for yourself, despite it not belonging to you.
I am curious if you would be fine with someone emptying all your wallets if they accidentally found your seed phrase back up (ignore for the sake of this example any passphrases, multi-sig, etc.) How would that be any different to OP emptying this paper wallet that he found?
Respectfully, I'm not overly keen to divulge any additional info regarding my discovery than I already have. I have identified someone locally with the skills to search on my behalf for the original owner of the paper wallet. I'll update when I know more.
And respectfully, given that by your own admission you know very little about bitcoin but have now been convinced to start handing over data to privately to a single individual, there is a high chance here that this individual will attempt to steal the contents of the wallet for themselves.