It may be that some Swiss Banker made Turkey a “deal”. I think the Nazi’s used Swiss banks too. At the time they sheltered all depositors.
It may be that a large chunk of the Gold belongs to Erdogan the Islamist. He is a huge scale criminal.
One thing occurred to me is that with the gold in Switzerland, it’s much closer to home and it’s also accessible by land. With it being in the US, it depends on air or sea, and if the SHTF, then there will be no accessing it.