N.C. Gen. Stat. § 47-82
In all cases where the acknowledgment, privy examination or other proof of the execution of any instrument authorized or required to be registered has been taken by or before any ambassador, minister, consul, vice-consul, vice-consul general or commercial agent of the United States in any country beyond the limits of the United States, and such instrument has heretofore been recorded in any county in this State, but the official before whom it was taken has omitted to attach his seal of office, or it does not appear of record that such seal was attached to the instrument, or such official has certified the same as under his "official seal" or seal of his office, or words of similar import, and no such seal appears of record, then all such acknowledgments, privy examinations or other proof of such instruments, and the registration thereof, are hereby made in all respects valid, and such instruments, after the ratification hereof, shall be competent to be read in evidence.
N.C. Gen. Stat. § 47-82