We can only assume how bad can happen because here $4.4 billion worth of BTC will be sold, and on the other hand, FTX is going to repay a total of $14 billion to $16 billion in fiat (I am not sure, but I think they will repay in fiat), which might not have a big impact on the market because if money is given in fiat, even half of it, is used to buy BTC, it will recover its price in no time.
Bitcoin market cap is over $1 trillion and daily trading volume is up to $50 billion so even if the US government sold that $4.4 billion I don't see anything scary. The market will likely react negatively to that selling pressure but if it can absorb all that bitcoin then it shows that the market is very healthy. For me, I only panic when they sell bitcoins to the market but there is no liquidity, that's when I panic.
If they sell bitcoins to the market, it means the amount of bitcoins they hold will decrease significantly and that is good for us and the market. Look at the positive side of things instead of just looking at the negative side.