Nuncio
From The Fifth City Wiki
Where mailmen go when they get frustrated, bored, or ashamed by what they do. All lost or refused mail ends up here, and they try to deliver it. The statue in the middle changes, according to what culture is living there. The currency is dead rats. Their uniform has correspondence symbols sewn over the heart. In the back of the post office, a pit reaches several hundred feet down, seemingly without end. The post office workers avoid it.