Probably decrease the price, the government will sell the coins at lower than market value because they want to sell them fast. With this volume of coins being undervalued it could have some negative effects on the price.
The bidders aren't financially retarded, though. They didn't get rich by being idiots. They know that if they were to buy 50k coins from exchanges all at once, they would run up the price and have to pay more for the 50k coins. So, they put in their bids accordingly, knowing that the other bidders are also aware of that fact. In other words, easily paying a higher price than what is listed on exchanges.