Whenever the handling of any variety of cherries is regulated pursuant to §923.52 or §923.53, each handler who handles cherries shall, prior thereto, cause such cherries to be inspected by the Federal-State Inspection Service, and certified by it as meeting the applicable requirements of such regulation: Provided, That inspection and certification shall be required for cherries which previously have been so inspected and certified only if such cherries have been regraded, resorted, repackaged, or in any other way further prepared for market. Promptly after inspection and certification, each such handler shall submit, or cause to be submitted, to the committee a copy of the certificate of inspection issued with respect to such cherries.