New Jersey Administrative Code
Title 13 - LAW AND PUBLIC SAFETY
Chapter 45A - ADMINISTRATIVE RULES OF THE DIVISION OF CONSUMER AFFAIRS
Subchapter 21 - REGULATIONS CONCERNING THE SALE OF FOOD REPRESENTED AS KOSHER
Section 13:45A-21.4 - Recordkeeping requirements

Complete and accurate records of all meat and/or poultry purchased as kosher shall be kept by dealers. This shall include the name and address of the slaughterhouse, wholesaler or other source from which such purchases are made, the dates, quantities and identity or nature of meat and/or poultry, and copies of all invoices and bills of sale. A dealer shall retain such records on its premises for a two year period following the purchase of properly identified kosher meat and/or poultry. Wash letters as referred to in 13:45A-21.1 shall be kept as long as the meat is in possession of the dealer and shall be kept attached to its appropriate invoice.