Duty to inform in NC is only while carrying (on or about your person) a concealed handgun and in possession of a Concealed Handgun Permit.
§ 14‑415.11. Permit to carry concealed handgun; scope of permit.
(a) Any person who has a concealed handgun permit may carry a concealed handgun unless otherwise specifically prohibited by law. The person shall carry the permit together with valid identification whenever the person is carrying a concealed handgun, shall disclose to any law enforcement officer that the person holds a valid permit and is carrying a concealed handgun when approached or addressed by the officer, and shall display both the permit and the proper identification upon the request of a law enforcement officer. In addition to these requirements, a military permittee whose permit has expired during deployment may carry a concealed handgun during the 90 days following the end of deployment and before the permit is renewed provided the permittee also displays proof of deployment to any law enforcement officer.
In the trunk is transporting; it is not readily available to you.
Leave it in the open, then you have no "duty to inform".