Go to the office that you shipped it from in PERSON. it's much harder to brush off a person standing in front of you than one on the phone.. talk to a supervisor.. or his supervisor.. don't go away until you get someone to who will try to figure out what happened.. They don't "lose" boxes.. they're whole business is making sure boxes are delieverd.. it's someplace, they just haven't put in enough effort to find it yet.