I have a security clearance with DOD. Those 15 boxes of documents which some were confidential. That's not sensitive material. A message to put ensign at half mast was a confidential message, weather reports were confidential.
I find it extremely hard to believe sensitive nuclear documents are stored in boxes in the Archives. Really? There might be old stuff of limited relevance, who knows.
But if...if important nuclear info was on paper and kept in cardboard boxes, now that's troubling.