Was intrigued by Consumers issue here. Obviously my first thought is "fuck that free money, come get it off my corpse" but didn't figure that was the best advice to offer someone. Quick google research reveals yep thats definetly illegal however
"Another approach where people have benefited from their windfall, is to put it in a separate savings account and earn interest until the error is rectified by the bank or the rightful owner has been tracked down. This strategy was successfully adopted by a postal worker in the US who received a pay rise that he knew he was not entitled to and immediately informed his supervisors of their error."
Might be worth a shot. 10% finders fee for any profit from this scheme would be appreciated.