Yeah there is nothing to worry about that. As far as I know, they have announced it in the past that they are going to sell the seized Bitcoins in portions within a certain period, and it's probably one of the portions they are going to sell as they did in the past, and we haven't seen much of an effect on the price in the past as well.

They are also not going to dump all the coins they hold at once because they aren't doing this for money last time when they sold a portion of the coins, the price of Bitcoin was pretty low, and if they were doing it only for the money and profits, they could wait for the price to go up and then could sell the coins.

Neither this, nor any of their selling in the future will affect the price or the market in any way, besides, there are more Bitcoins bought and sold than that amount of a daily basis, so I don't think this will have any significance in front of that.