Haw. Rev. Stat. § 502-51: Exemption of instruments offered on behalf of United States.

In the case of any deed, lease, mortgage, lien, notice, agreement, or other instrument offered for recordation by any judicial, executive, or administrative officer of the United States, acting in the officer's official capacity, or by any duly authorized officer or agent of any agency or instrumentality of the United States created by or under federal or state law, acting in the officer's or agent's official capacity, it shall not be necessary that the instrument, where the instrument is required to be signed by the officer or agent, be acknowledged before a notary public by the officer or agent, and the registrar of conveyances shall accept the instrument for recordation, when the signature of the duly authorized officer or agent, together with the official seal, if any, is attached to the instrument for recordation.