They apparently had 500k BTC in their MtGox account, which is insane. Unless they were actively trading all of that they should have withdrawn from MtGox to the BitCoin network.
I keep reading about people only being able to take a small number (50 or 80 BTC) out of the market at once, which is why the hacker couldn't do the same.
If that is true, then once you have your 500k BTC in the exchange, it will take you over a decade to get them out, either as cash or as bitcoins.
