From what I understand DPR has claimed ownership interest of the 144,000 BTC so that will tie up those BTC for a while.
I assume they can sell the smaller wallet sooner since DPR did not contest the ownership of those BTC.
In principles, LEAs cannot sell properties belonging to the defendant until he's proven guilty. BUT it's a common practice to sell stuff before the end of the trial when (valuable) stuff is sensible to depreciation. This is in the interest of both partied, the defendant and the State, whoever wins the trial, to keep the value until the end of it.