The work performed by licensed inspectors under the provisions in this part shall be supervised and reviewed by authorized representatives of the Administrator, who shall issue to such licensed inspectors instructions for taking, preserving, and identifying samples; marking and maintaining the identity of containers when filled; preparing, issuing, and disposing of certificates; the keeping of adequate inspection records; and such other procedures as may be necessary in carrying out the licensed inspection. The handling, sampling, grading, marking, and certification of naval stores at an eligible processing plant by a licensed inspector shall be conducted in accordance with such instructions and the provisions in this part.