On the date of giving the transferable notice of the delivery in accordance with subsection 15b(f) of the act the person issuing such notice or the person on whose behalf it was issued shall also give written notice to the Marketing Services Office with which the classification request was required to be filed, specifying the date of delivery and the number of bales so to be delivered which have not been certified. In such notice, or later in writing before the delivery of the samples to the Marketing Services Office the lot numbers of the cotton so to be delivered shall be specified.