That all sounds very believable, but still, like the Vatican - there will be many archives and levels of secrecy under previous and current management. I could see where COB would want his internal IAS advices tweaked for a somewhat general upper level distribution but will that include correspondences on things like managing the surveillance of his dad, etc? That stuff is in the Holy of Holies.
The Nazies liked to keep a lot of docs also but even the mob knows better than to be too organized.
You should read the whole link. You are correct...there are various databases granting various users various access. I just copied and pasted what I had remembered reading about the one pc but it did not contain all of Ron's blatherings.