N.C. Gen. Stat. § 47-86
In all cases where, prior to the first day of January, 1891, the acknowledgment, privy examination of a married woman, or other proof of the execution of any deed, mortgage, or other instrument authorized to be registered has been taken before a clerk of a court of record in another state, and such clerk has failed or neglected to affix his official seal to his certificate of such acknowledgment, privy examination, or other proof of execution, of such deed, mortgage or other instrument, or where such court had no official seal and no official seal was affixed to such certificate by reason of that fact, and such deed, mortgage, or other instrument has been ordered to registration by the clerk of the superior court of any county in this State and has been registered, the probate of any and every such deed, mortgage, or other instrument authorized to be registered shall be and hereby is to all intents and purposes validated.
N.C. Gen. Stat. § 47-86