It comes on the same day that three others involved came to federal court for the first time.
A U.S. Marshal's van brought the trio to the federal courthouse in Raleigh Thursday.
All have been charged with illegally immigrating from Mexico. One appeared before a judge - but hearings for the other two were postponed until Monday.
Authorities believe at least some of the men may have dropped off live munitions at a Raleigh scrap yard.
Eyewitness News also received photos from the Sanford police, showing spent shells and live small arms ammunition found at a house in east Sanford.
The man who lives there is now being held in the case.