Richard's cross-referencing with his old intelligence reveals not much. He does note, however, that most of the raider scum have not explored or travelled near the supposed location of the robots' patrols, from what he can see. Perhaps they had the good fortune not to stumble upon forces that could easily destroy them? The vault of stuff in the ruined town is similarly untouched, because it seems the black neck tattoo people avoid urban ruins if they can help it (logical enough).