Any person who licenses vehicles under subsection (b)(2) above shall keep and preserve for three years the mileage records on which the percentage of the total fleet is determined. Upon request these records shall be submitted or made available to the Commissioner of Motor Vehicles for audit or review, or the owner or operator shall pay reasonable costs of an audit by the duly appointed representative of the Commissioner at the place where the records are kept.
If the Commissioner determines that the person licensing vehicles under subsection (b)(2) above should have licensed more vehicles in North Carolina or that such person's records are insufficient for proper determination the Commissioner may deny that person the right or any further benefits under this subsection until the correct number of vehicles have been licensed, and all taxes determined by the Commissioner to be due have been paid.
N.C. Gen. Stat. § 20-84.2