I normally lurke, but I do run an internet / shipping business and can offer a little advice. The best scenario is if the zip can get fixed before they send out your package. If it doesn't and the package ships out with the wrong zip your best bet is to call 1-800-PICK-UPS with your tracking number and let them know. They can reroute the package to you. It may add a day or two, but it won't get lost in UPS neverland that way.
Hope that helps!