As someone who grew up in a country where hundreds of millions of $$$ were stolen from the people by the government officials, and than transported illegally out of the country - I can tell you you're very naive about how openly these high-level international crime deals are done. What they did was simply load the money in an airplane and fly them to a small, corrupted country (Cyprus in this case) where the banks and the local government were in the deal for a cut. No need for bitcoins or any other technology that leaves easy to follow traces. Just paid everyone a cut, probably someone in the West too, since country was under UN sanctions at the time. And money was never recovered, nor anyone got prosecuted for it, of course.