He may have served his time for fraud, but that doesn't mean he gets to keep the spoils. So would have the 60M seized, and then possibly arrested on new charges (something like tax evasion or lying to the court etc).
That time should have some provisions for the amount in it or not? I mean; if he does give them the password, does he get significantly less time or the same time? If it's the same, I would feel less morally conflicted about using the money afterwards as I already did my time, in part, as payback for the amount. But yeah, he committed substantial fraud, so not sure if the word moral enters anywhere in this conversation.