All of this is a cool idea but don't forget, if you ever tried to sell them you would have to be very careful because they are coins that never saw circulation, from a country that only existed for 4 year, if authentic, anyone is going to be asking you where you got them.. that could be an issue..
Its like the guy that bought a storage unit with $8,000,000 in a safe, technically it was his because he bought the unit, but you can't exactly carry $8,000,000 into a bank and deposit it without a shitload of red flags..
(he returned most of it to the owner and kept 1.5 MIL I think)
You could hide it under your bed and worry for the rest of your life if someone would ever find out and come for you.. hahaha