The sliding box would be big enough for a SR 5th edition CRB, but nothing much larger. It completely closes up to be slid through to the locked room (and must pass through the ward on the way)

The suite has too rooms — the reception area that you are in, with a door to a hallway, and the inner office (the locked room) which opens only onto the reception room (although it is on the outer wall of the building, and may have a window.