It would seem since there is NO OTHER trade like this happening on the entire exchange that there would at least be SOME discussion on it.
That is close to 10 bitcoins a day right there and I know it may not look too much but that is the only one we know of, maybe there are others in other pairs and all that and that means they can be tampering with their own volume a lot more than we know. It could be a trading bot trying to sell what someone mines as well, still a trading bot but not to make profits just trying to sell what the miner mined and there are plenty of people in the world who makes 10 bitcoin a day mining.