According to a Japanese English-Language newspaper, one of Gox's lawyers is saying that the coins disappeared during the ddos attacks that took place in the days just prior to the shut down.
If that's the case and the coins were moved, there'd be a significant spike in the BTC days destroyed. The only spike is on the 8th of March.
Good point!
I wonder how long it's going to take Mark's lawyer to catch on to that one. I imagine he's still at the bottom of the Bitcoin learning curve.