[saskflames69]

Depends. When my dad was in university, he found one of those old $1000 bills in an envelope in the washroom. He took it to the bank to see if it was fake. They asked him where he got it from and he told them he sold his car (lies). It turned out to be real.

In those situations, you're not likely to find the person who lost it. Had the money been in a wallet with ID, then my dad would have turned it in to the police.

If I found $10000 without any form of identification present at a busy place like a mall, then I would return it. But if I found it on the street - it's out in public, that means it's open season and it's gonna be mine.