It appears that Ft Knox was not nuked with anything of significant size (Howling Wilderness), but it's unlikely anyone would know for sure it would be spared prior to the exchanges.
It's also fairly likely I think that such a high value facility would be tough enough to withstand a strike nearby (direct hit no so much). In my mind shifting the gold prior to nukes being thrown about creates more problems than it solves.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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