N.C. Gen. Stat. § 106-245.19: Invoices.

(a) Any person, except a producer marketing eggs to another person for candling and grading, when marketing eggs to a retailer, institutional consumer, or other person shall furnish to the purchaser at the time of delivery an invoice showing date of sale, name and address of the seller, name of purchaser, quantity, grade and size-weight classification.

(b) A copy of such invoice shall be kept on file by both the person selling and the purchaser at their respective places of business for a period of at least 30 days. (1955, c. 213, s. 7; 1965, c. 1138, s. 1.)