From what I’ve read, the last true audit of the gold at Fort Knox was in 1953.
One argument against a new audit is that it would be too expensive. Not if you just do a count, then randomly check one bar out of every 50. Do that every five years or so. No big deal.
So I can’t see why cost would be a problem. There must be some other reason.
I think that “audit” was just a bunch of press going thru one or two of the rooms at Fort Knox, to get a few pictures.
Satisfied now?