i was employed at the dmv once and i use to have this 'debate' with people all the time:

them: "that's my address"

me: "...u can't live in a PO Box, sir"

them: "fuck you"

me: "have a nice day"

(or, if a karen)

them: "i want to speak to your manager"

manager: "you can't use a PO box for your residence"

them: "reeeeeeeeeee!"