It's about, if you have a piece in your museum, and you know in its chain of ownership, it was looted from, say, France during, say, the German occupation in WWII. Even if all the parties involved are now dead, there's a case to be made to transfer the artifact from a German museum to a French museum.
And this argument holds some weight and can be extrapolated to many other scenarios.
In your case if items exist in the museum looted from a nation that no longer exists (and isn't like Czechoslovakia which was split up into currently existing nations) and the nations in that same land aren't culturally connected or caring to have the artifacts, fine. Nothing else can be done
It's about, if you have a piece in your museum, and you know in its chain of ownership, it was looted from, say, France during, say, the German occupation in WWII. Even if all the parties involved are now dead, there's a case to be made to transfer the artifact from a German museum to a French museum.
And this argument holds some weight and can be extrapolated to many other scenarios.
In your case if items exist in the museum looted from a nation that no longer exists (and isn't like Czechoslovakia which was split up into currently existing nations) and the nations in that same land aren't culturally connected or caring to have the artifacts, fine. Nothing else can be done