I would too. I’m sick of banks screwing up and acting all high and mighty. I mean she was wrong but arrest is not warranted.
There are 3 possibilities. Another customer transposed a number. Someone gave another customer the wrong number. The bank messed up.
In he first two cases they could ask and a good and decent person would return the cash. If the woman was really honest, she’d have returned it. In the last case, the bank is at fault and should pay the appropriate party.