Heh, last year I was renewing my car registration online and used an option in the system to send the license plate tags to a new address I recently moved to. I ended up fat-fingering the zip code and was really worried that they wouldn't arrive, but to my surprise new registration came to my new address a couple of days later. I can now see how such a small typo is a non-issue to a carrier that's dealing with routing issues like you're describing!