N.C. Gen. Stat. § 35A-1263.1

Whenever any property not included in the original inventory report becomes known to the guardian or whenever the guardian learns that the valuation or description of any property or interest therein indicated in the original inventory is erroneous or misleading, he shall prepare and file with the clerk a supplementary inventory in the same manner as prescribed for the original inventory. The clerk shall record the supplemental inventory with the original inventory. A guardian who fails to file a supplementary inventory as required by this section shall be subject to the enforcement provisions of G.S. 35A-1262.