Thinking about it...you know you'd obviously have to pay it back eventually...but...if you feigned ignorance for a while, could you keep the interest you accrued before they cottoned on? Or would they cotton on immediately you think?
Although it may be a little different for 1.4million, you'd be surprised what places will let you keep if they make a mistake rather than risk the bad publicity coming out about the mistake.
"I know someone who picked up loads of cigarette s in the street after the local pub had be broken in.
The police came and caught him with them as he was going home so he was charged and fined for it. "
a local pub was broken into here and all that was taken was cash and cigarettes from the machine. The poilice said that they wouldnt be able to arrest anyone and the cigarettes and cash would be untraceable.