I. A seller or manufacturer shall incorporate the cautionary statement required by RSA 339-A:9 in a contract for sale with the purchaser. The cautionary statement shall appear in the contract immediately preceding the place in the contract for the purchaser's signature. II. If a contract for sale does not exist, the statement shall be printed on a label containing no other written material and attached to the fiber board, particle board or other similar construction material, or housing unit or manufactured housing containing urea-formaldehyde resin.