@red33410: Early in my career an old-timer imparted some valuable advice: whenever you are away from your desk make sure that you are carrying a folder or a pad or something. It makes just about everyone believe that you are working even though you may be socializing or goofing off.
I suspect that is what everyone but Wally is doing. Even if Wally carried something nobody would ever believe he was working. With that in mind, why would he bother?