Years ago, I received a call at the DMV. Customer was asking if she had left her wallet behind when she had been in earlier, and yes, we had found it.
She comes in the next day, and I verify that the license in the wallet was hers. She is all smiles until she opens the wallet. Where is her $500 in cash? (There was maybe a dollar in it).
Ma'am, I'm sorry but the only thing we really looked for was your ID. We didn't take anything out of it.
"I had $500 in cash which I was going to use for Christmas shopping!"
I looked at her for a second, and then calmly said, "Then you need to contact the police and file a report." She crumpled and left without a further word. I don't know if she had planned a scam all along, or was just taking advantage of a situation, but we never heard from her or the police.