I have a NC permit as well, and it's state law to inform regardless as to if you're armed or not.
Where did you get that information from, because it is incorrect. Might want to read the law for yourself. I'll help:
§ 14-415.21. Violations of this Article punishable as an infraction.
(a) A person who has been issued a valid permit who is found to be carrying a concealed handgun without the permit in the person's possession or
who fails to disclose to any law enforcement officer that the person holds a valid permit and is carrying a concealed handgun, as required by G.S. 14-415.11, shall be guilty of an infraction and shall be punished in accordance with G.S. 14-3.1. In lieu of paying a fine the person may surrender the permit.
(a1) A person who has been issued a valid permit who is found to be carrying a concealed handgun in violation of subdivision (c)(8) or subsection (c2) of G.S. 14-415.11 shall be guilty of a Class 1 misdemeanor.
(b) A person who violates the provisions of this Article other than as set forth in subsection (a) or (a1) of this section is guilty of a Class 2 misdemeanor. (1995, c. 398, s. 1; 2011-268, s. 21(a); 2013-369, s. 16.)
§ 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.