They must have sold it for a part but I think that its also logical that they have hold some of it to make more profit in the future.
I do not think they are stupid and think that the bitcoin will not have a great future.
but I guess it's a bitcoin very much. bitcoin hold as much as it will calm you down, so I feel they will continue to sell, or exchange into money, but in a slow and piecemeal. due to the very large transaction, they may be striking. Well, maybe this time they are trying to remove any trace of them.