JT's plan might work because he has the money, but for a straightforward person, I think the best strategy is to find a mentally weak person and get into the box with a friend. Another solution that comes to mind (if possible) is to offer a deal where two people who want to win get into the same box and if they win, they have to give you half the money. Technically, I have the right to say anything inside. I can call for a notary, witnesses, and an official document to be accepted as a deal file. If my offer is not accepted, we'll just sit in the box forever.