Given his past it is easy to imagine his keys got misplaced while on the run or met with some kind of "unfortunate accident".
Pretty good incentive to say nothing isn't it?
Not really. He's already in his fifties and faces 20 years in US prison, and then he will probably be deported to the Philippines to spend the rest of his life in prison. I imagine if he had access to billions he would he would be paying mercenaries to bust him out.
You think mercenaries can be bought to 'bust' someone out of an American prison? That is such a ridiculous statement in so so many ways.
ADX Florence? Probably not. Fort Dix? Almost certainly if the price is right. It's more like a glorified summer camp than a prison.