Each registered inspector shall maintain a copy of each written report of the date, lot description, volume, and condition of the commodity inspected. Condition shall include the grade or other criteria used to evaluate the product. If a report has been made orally, a written confirmation shall be prepared within 24 hours and retained in the same manner as a written report. Reports need not name the person to whom the advice was given, but the names shall be maintained so that they may be matched to the respective reports upon request of the commissioner. Reports shall be maintained for a period of not less than 90 days and shall be made available to the commissioner upon demand.