The 'official' study of the subject has been compartmentalized within the private sector since at least the late 80's, and maybe the late 60's or earlier. It's outside government at this point, contract work done in the realm of private industry, with people like Robert Bigelow. That's the "stuff" to which I refer.
Basically the "government" doesn't have to hide anything. If there is anything palpable, it isn't their secret to hide, and hasn't been for a long time.
As for what there is in terms of material "stuff", I have no way of knowing, and wouldn't speculate.
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