It's a sarcastic question, of course. The mail doesn't work, except in Fedland. All the mailboxes have been unbolted and used to decorate the apartments of nostalgia freaks. But it's also kind of a joke, because the destination is, in fact, a building in the middle of Fedland. So the joke is: If you want to deal with the Feds, why not use their fucked-up mail system? Aren't you afraid that by dealing with anything as incredibly cool as a Kourier you will be tainted in their eyes?