"But at the same time, if you look at the way bitcoins operate after a crime is committed, you can not rewind and take back that money," he said. "With the presence of bitcoins and other secrets, we have yet to find it, so that's a problem."
They can take back that money easily. They just need to find out their legal (or not) equivalent of the 5$ wrench (
reference) and they'll transfer that money wherever they want.
Of course, burying their heads in the sands is easier. Even
ostriches do that.