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As long as they are at least .999 silver it doesn't matter where they are from. Some coins have lower minting which makes the collector value higher but the price of silver changes all the time.

Well I just checked one of the bags (I have some in a display case and still some I need to brush up) and its 1389 gram of silver coins with 72% silver so it is 1 KG of silver and the coins are Dutch coins that were actually used in the past hence the lower % to make the coin harder (I guess)

That is still really cool and if they are older coins then the value could be even higher especially if they are in good condition.