If it would be possible to find out where the billion(s) of Prayut's Thai Baht come from, the military dictator had to flee Thailand, too. The problem is. Prayut has the judicary completely under control, therefore we will not learn where his dubious money comes from. Be sure, not from his monthly military salary!!!
But I'm sure YOU are "closing your eyes", when the military dictator took the regime by a cup! Not by an election - like Thaksin. That's a big difference, but this will not go into your mind/brain.