9 CFR 381.127 Wording on labels of shipping containers
381.127.a Each label for use on a shipping container for inspected and passed poultry products shall bear, in distinctly legible form, the following information:

381.127.a.1 The official inspection legend.

381.127.a.2 The official establishment number of the official establishment in which the poultry product was inspected, either within the official inspection mark, or elsewhere on the container clearly visible and in proximity to the official inspection mark.