Register as a 4. If not resolved ahead of time, do as others have said and print out your request submission as well as race resume and copy of the data from usacycling that shows your request as open, and get there early enough to track down an official and get the matter resolved prior to picking up your # at the registration desk.
Before we get too down on upgrade coordinators, let's remember that they are doing this as VOLUNTEERS, which probably represents way more contribution to our sport than most of us posting on these forums.