(https://www.cryptoground.com/mtgox-cold-wallet-monitor/)
I know that some big entities in the Asian market have been manipulating the price in the last week or so, pulling the price down, but it was not the Mt. Gox coins that is being move. But it could be some whales who doesn't want the price to peak because they wanted to play the market more in their favor.
Groups that want to move the market can do so without even having bitcoins themselves, there are a number of ways of doing it through FUD and other techniques, they don't need to use massive amounts of bitcoin to do it. They have been doing it for years already and it is much harder to notice.