The great thing about cryptocurrency is that it is not tied to a government.
HURR DURR, well except for the fact shitcoins run on top of the govt's own infrastructure with completely non-obfuscated traffic, allowing them to be obliterated in seconds just like how they censored Zerohedge in New Zealand for no reason. Even if you obfuscate the traffic, transaction validators are designed to centralize into a tiny amount of football stadium-sized mining facilities that the govt can just walk up to and seize it or shut it down.
The fact the govt so far has done absolutely nothing to try and stop digital shitcoins and instead they promote them and actually create bills in congress ENCOURAGING people to use them tells you all you need to know - it's a govt created scam to try and lure people into a cashless society slave system and away from physical metals.
You will need to a truck to transport your metals.
Roach is only talking in theory anyhow, because he can fit all of his metals into one suitcase. In other words, he don't got much. But he has enough to make border crossings an issue... accordingly, if he does not want to report what he has, then he is trapped domestically, or he will have to make several trips while carrying less than $10k in value each time (which might not be a problem for him given his stash and the ongoing depreciating value of such) or employ some kind of capital movement accounting evasion methods., which would likely not be good if he were to get caught.