Haw. Rev. Stat. § 508D-12: Indication of receipt of disclosure statement.

(a) The buyer shall indicate receipt of the seller's disclosure statement on the real estate purchase contract, or in any addendum attached to the contract, or in a separate document.

(b) Receipts taken for the disclosure statement shall be kept on file in possession of the seller or seller's agent for a period of three years from the date the receipt was taken.