Comment Re:I'm betting that... (Score 1) 143
FWIW, the law very rarely supports "finders keepers losers weepers". The short story on that is that "physical posession does not prove or establish transfer of ownership". The only time that has a chance of winning is when the loser fails to establish they ever had ownership. But in this case, she gave it to them, and that 100% transfers ownership. Legally, they owe her nothing, and would be unlikely to lose in a court case.
Someone above cited big business as above this law, such as a "bank error in your favor" getting yoinked back. No, in that case when you sign the paperwork to set up the account, there will be specific wording in there saying you agree that bank errors are NOT in your favor and you will be legally obligated to return any cash withdrawn under those circumstances. The only difference here as far as the bank is concerned is they didn't stop you before you got money from them (unlke say, a bounced check) and so now there's a bit of additional burden to having go to after you to get the money back. (it usually doesn't work that way, so that just tends to get them wound up)