I worked five summers at a moving company. We were not allowed to move general firearms. We were allowed to move historic pieces and non-functioning firearms. That being said, when we had important customers, we had them put their firearms in a carton, seal it, and label it as something very valuable, and not a firearm. Then we would inventory it as what was written on it. We also had dirtbags working for us, who would probably try to steal if they knew what was in the box. My suggestion would be to find an alternative shipping method. If you really want the moving company to take them, then put them in a box, well sealed, and label it as "Grandma's Monogrammed China".