The William Oliver room is a special collections room in an off-limits area of the library's stacks. People wanting to do research there must apply and make an appointment. They'd then be escorted by security to the locked door where Greg Priore would greet them. Greg would oversee the visits and of course the collection itself as there are many items that are valuable or rare or both. Greg was untouchable for many years and I think he was trusted too much. He and John from Caliban began selling items in addition to cannibalizing books for individual pages, they're horrible people. The room was under no surveillance, only Greg and security had a key to the room.