To prevent the unfair or deceptive acts or practices specified in §203.46 of this title and §203.48 of this title, funeral providers must retain and make available for inspection by Commission officials true and accurate copies of the price lists specified in §203.46(b)(2) - (5) of this title, as applicable, for at least two years after the date of their last distribution to customers, and a copy of each Purchase Agreement, as required by §203.47 of this title, for at least two years from the date of the arrangements conference.