As I posted before, in Mark's shoes, I would say NOTHING. "Confidential" Let everyone speculate and drive the price down to $1. Spend $40,000 if people were dumb enough to sell me BTC for $1 and pay everyone back the 40,000 BTC that he was robbed. While everyone piled up Mt GOx USD balances I would begin buying BTC and freeze USD withdrawals, all fiat withdrawals.
Then the only way to get your money out would be to buy BTC with your locked up USD, on a limited basis of course. The buy pressure would be massive and drive the price back to the +200 rate it was before so whats that about a peak of $800? At least with the coins I have, I am hoping that's what he does
