While this is an old thread, I wanted to provide my experience at appealing as others may come across this thread through searching.
I have a 2011 Mazda CX-9 that I bought used in Dec 2014 while in NJ. I relocated to NC in January and registered my car.
The appraised value was: $17,880
I emailed
revhelp@wakegov.com a copy of a service invoice from Dec 2014 which indicated the mileage of 79,099 and appealed the value.
Within 2 hours I received confirmation back that my appeal was accepted and adjustments had been made to the value.
My revised appraised value is: $15,734 and I will therefore be receiving a refund of $19.92.
So the process was very easy, quick and successful in this example. It may not be a large difference from a refund perspective, however I will continue to benefit the lower appraised value each year.
TheWombat