That's a tough one, Cherie. I think I would have reported it to the mall office and given them my number to call me if anyone inquired about found money. I know better than to just turn in a wad of cash.
A friend and I once found 3 $100 rolled up tight about as thick as a pencil. We went to the mall office and told them only that we'd found some money. They (two 20-something guys) tried to talk us into turning it in, but their looks told us not to. So, we gave them our home phone #s and asked them to call us if anyone asked about lost money. That night, the call came and they gave me the person's phone number and requested I call. Turned out, it belonged to a young couple (the "he" of whom will never live it down, I'm sure) and it was all their Christmas money for their two babies. My friend and I met them at the restaurant next to the mall and gave it back. The wife had said during our call, "I don't know WHY that idiot thinks rolling up money is smart!" Evidence. If you plan to lose money, make it look unique!