N.C. Gen. Stat. § 58-70-50: All collection agencies to identify themselves in correspondence.

All collection agencies licensed under this Part to do the business of a collection agency in this State, shall in all correspondence with debtors use stationery or forms which contain the permit number and the true name and address of such collection agency.

The permit to engage in the business of a collection agency shall at all times be prominently displayed in each office of the person, firm, corporation or association to whom or to which the permit is issued. (1931, c. 217, s. 9; 1969, c. 906, s. 5; 1979, c. 835.)