Charles set this up one day and insisted that everyone who went in to the media room had to sign in. He was very careful to get names correct and check you on and off the list as you moved around. He kept his drink on his desk so he didn’t have to leave for refreshments. The box on the side is for his money / reciepts.
Charles picked a very strategic location with lots of traffic. Clearly he is learning from his earlier, less successful efforts.