A couple of observations:
1 - You are right that there are a lot of "off the books" dollars. Case in point:
of verifiable missing dollars. (see my post The US Government Lost $1.2 Trillion In 2017 + $250 million per day since September 11, 2001)) for an official breakdown of this figure.
2 - Regarding Japan, can you (@themoneygps) or anyone else here explain WHY they and their currency has not yet gone into hyperinflation given the decades of excessive money printing? In other words, how is that possible?
If it hasn't yet blown up, then what economic theory would state that they couldn't get away with it for another decade or two?
how much more printing can the systems sustain before it all goes to shit?