N.C. Gen. Stat. § 47-50
In all cases prior to October 1, 2005, where it appears from the records of the office of the register of deeds of any county in this State that the execution of a deed of conveyance or other instrument by law required or authorized to be registered was duly signed and acknowledged as required by the laws of the State of North Carolina, and the clerk of the superior court of such county or other officer authorized to pass upon acknowledgments and to order registration of instruments has failed either to adjudge the correctness of the acknowledgment or to order the registration thereof, or both, such registrations are hereby validated and the instrument so appearing in the office of the register of deeds of such county shall be effective to the same extent as if the clerk or other authorized officer had properly adjudged the correctness of the acknowledgment and had ordered the registration of the instrument.
N.C. Gen. Stat. § 47-50