They will sell it today or tomorrow. Unless they sell it at once, the market shouldn't react much. Because Bitcoin already pumped a lot and due to their sale, it won't be a be a massive dump. But if they decide to sell everything at once, then we may see a massive dump. Its just not for sale, but it will create a FUD, and investors will panic. I hope institutional investors will back massive sales. They are constantly accumulating Bitcoin, even at its high price. So buy-in demand is pretty high right now. Unless traders panic, Feds won't dump the bitcoin for selling it.