He keeps moving it around a little bit lower than the price at mtgox. I don't think he wants to sell it - because in that case he'd just transfer it to mtgox - it takes only an hour and he'd get a better price. I suspect he is rather trying to suppress the mtgox price so that he can buy there - while having little risk that someone will buy his 2k because at th this is a huge amount and it is much slower to send money there then to send btc from there to mtgox.
I'm not sure, but I've been picking away at it a little at a time. Having a hard time getting enough dollars into TH to clear him out though.
