Seized and sold bitcoins are being "recovered" through drop and shop techniques on the market, pushing exchange rates down and grabbing BTC when possible.
What do you think the source of funds could be for this replacement (recovery) buying? Could it have come from exchanging the bitcoins purchased by Willy and Markus bots during the November, 2013 price spike for fiat? If so, that implies someone all this time must have been sitting on a rather large pile of fiat from those proceeds. I have seen in another forum speculation that these funds have been frozen by the Chinese government. This is really beginning to sound like the plotline for a Mr. Robot episode.