Really? So. what was their reason to exclude the fake Hidell ID?
What an absurd go nowhere question.
By the time of the exhibit, the Hidell ID has been firmly established to be in Oswald's wallet at the time of his arrest, it's clear that the Hidell ID which actually exists was elsewhere, perhaps in another section showing all the Hidell evidence.
The best idea is, why don't you get up off your butt and ask the National archives yourself because all Charles, others and myself can do, is give logical speculation as to it's whereabouts. And whatever the answer is, it won't satisfy you because you have a closed mind for any answer that doesn't include conspiracy.
JohnM