It is probably not purely random coincidence. But it may be a complicated interaction of different factors. Here are some possible theories:
1) A group of bidders agreeing among themselves to bid low and use their money to raise the market price, so that they can dump on the market afterwards. What is the risk? Someone can outbid your collective (remember though there are a lot of coins), but in that case you would have bought some bitcoins from the market and nothing from the auction... Not so bad if you can accept that risk.
2) In fact the prospect of the auction may be what was keeping the price low in the first place. When people realized that it will happen, and there are serious bidders (maybe some big people with internal knowledge knew already who bid what approximately), they decided to buy at the current (low) price, which won't remain low for long.
3) Maybe the auction (which is a one time opportunity in the end) motivated some people. To get loans, find some investors etc. to grab those cheap coins. But, once you realize that you are probably outbid in the auction, you may go to the exchanges to buy what you can. In fact other people understanding this fact may raise the price as well.
Think about it. There were 11 bidders. If you are guessing that these were partial bids which total to about 4-5 times the total amount around 300, you have maybe 4x44000x300 dollars at the hands of people who want to buy bitcoins. If they fail the bid some of them may very well turn to exchanges...
I may think of other factors, coupled with other things, such as those happening in China may somehow explain the mystery. However, the explanation that it is the Marshalls who pumped the price to sell their coins at a better premium is pretty ridiculous. Where do they get the money? Is it an official order? Who signs the order to buy? The marshalls have accounts in the oversees exchanges?