Legal tender coins and moving abroad

Does anyone have any experience moving abroad with their gold or silver coins or bars?  I know you can have $10,000 with you, does that really mean you could take 10,000 ASEs or 200 Buffalos?  I'm not sure if anyone would even try it risking getting your stuff stolen or confiscated.  Along with that, why do government mints put a monetary value on their bullion coins?  Would it be easier to just sell your PMs here and then rebuy it when you get to your destination?  I know a lot of countries have restrictions on bringing in metals, but I am not sure if the legal tender aspect makes it then ok?  Thanks for your insights.