N.H. Rev. Stat. Ann. § 5:4-a

The secretary of state shall, during certain times within his discretion, put on public display in rooms 118 and 119 of the state house the authentic copy of the declaration of independence and bill of rights which he has in his possession. This document shall be displayed under conditions which ensure its security and protection from theft, damage, or destruction. When the document is not on public display, it shall be under the care of the secretary of state.