The funny thing is that when the previous auction of a good number of coins happened, that the price went up significantly, and suddenly dropped HARD once the auction was over. I think it's pure coincidence, but it will be funny if exactly the same thing happens again.
its very simple if you sell coins and the buyer dumps them on the market the price will lower.
its also simple that the state wants best price for coins and waits until the price soars
Manipulating market price will cost you extra so is not smart.