ALL TOO POSSIBLY TRUE
LOL
A former co-workers first job was to help catalog the contents of a warehouse like that. It ws an NSA warehouse, holding all the old stuff that NSA and predecessor service organizations squirlled away, going back to WW 1. NSA had no idea what much of the contents were.
Co-worker described it as looking like the warehouse in Indiana Jones. Now many of the interesting bits are in the spy museum. Not the holy grail, though. I could tell you where that ended up, but then your face might melt off.