We have different carriers all the time. And most of them can't read an address. Our neighborhood is less than 30 houses. The mailbox is right on the street with a big address number. At least once a week I get someone else's mail, and on a regular basis I get mail with a big circle and arrows pointing to my address. My mail goes to other peoples house and takes several extra days to get into my box.
The starting pay for a new carrier is $42,610 and goes up to $55,794. That does not count all the federal holidays, and retirement. If they work a little overtime they can make 70 grand just to drop an envelope into a box. No tip for my mail carrier. I am a generous tipper to waiters.
Letter Carrier Pay Charts