If they had dumped those coins during the Chinese panic it likely would of destroyed Bitcoin forever.
And they have EVERY reason to benefit by doing so. The only thing stopping the FED's is how they can't use those wallets until the trial is over.
No the opposite would have happened.
As the coins would have come from wallets known to be in their control. Everyone would know that they were dumping the coins to Cause a price crash.
In fact whenever they choose to sell, it will just be a bargain for anyone that has money on an exchange and I think the move would retrace in less than a day.