Is CRH'ing Exclusively An American/Canadian Thing?

Proofs arent actually that rare. I probably find about 1 in every ten boxes of nickels

Other countries do have their local equivalents of coin roll hunting. But, as I've said elsewhere, the continuing usage of "coin rolls" by banks are a peculiarly North American phenomenon. Everywhere else uses resealable plastic bags.

Further, as nalaberong said, it's less interesting in most places. The only three countries where you can search through pocket change and have even a theoretical chance of finding silver coins are America, Canada and Switzerland. And the banks in Canada and Switzerland have been much more proactive at removing silver from deposited coins and returning them to the central government for melting down. Everywhere else has reformed their currency at least once since circulating silver coins were abolished, so the old silver coins resemble nothing that currently circulates.