You know, that's a very smart play on her part.
If you HAD written it on the back, then you would have said YES, and she would have treated it as a robbery.
Since you said NO, she realized that you picked up a publicly available document , and weren't a real robber.
She could have just hit the alarm button, and caused you no end of grief.
Yes. But luckily as I'd been a customer for many years, and Mom worked at the bank, she already knew who I was and that I was not likely to rob them.