Full disclosure, I never handled anything above secret and never worked in a SCIF that had anything above TS, so I may be wrong for those items. Courier folders are serialized and track what was moved between storage areas. Within a SCIF it’s really up to the custodian and handler of the CI. Documents require a cover folder/sheet when outside of storage. Custodians are required to have an inventory of what’s in their safe, but no formal checking in/out system beyond couriers AFAIK. Inventory is annual (? Local policy could increase reqt but I think annual is minimum) Generally, if an item is in a SCIF, you as a handler are required to show your clearance and need to know for the CI. POTUS or his cabinet get to skip that second part essentially, because POTUS. Custodians don’t sit in the SCIF like a hall monitor, because they are bound by the same need to know rules as handlers. So if Meadows walks in and says I need document X. Custodian opens the safe, leaves the room. So yes, the honor system is a large part of this, because the penalties for anyone not POTUS are so severe that most people don’t push it. Inventory is also more about tracking loss in a catastrophic event and less about tracking items in and out. You as a handler log in and out of a SCIF, but you don’t log items in and out of storage, at least not on standard forms.