N.C. Gen. Stat. § 58-72-25

Upon the failure of any such officer to make such renewal of his bond, it is the duty of the board of commissioners, by an order to be entered of record, to declare his office vacant, and to proceed forthwith to appoint a successor, if the power of filling the vacancy in the particular case is vested in the board of commissioners; but if otherwise, the said board shall immediately inform the proper person having the power of appointment of the fact of such vacancy.