We are a registered shipper with both UPS and fedx. They know what we do.
Its federal law that you must give written notice to the carrier.
Generally the drivers do not care. Its the higher ups that do.
Here is something interesting that has just happened to me.
I just shiiped some ammo via UPS, something I have done before. I write on the box in several places, ORM-D. Which by law is required. I would just use a very broad marker, vesy to see. Well, my driver just returned the ammo and said security said it was not properly marked. I told my driver that I have done that any times before and he yes, he knows. But I have to have the proper DOT aproved labels to attached to the box. Which I had to get (not supplied by UPS) and then I attached they to the box. Now ok.
John Boyd
Quality Arms
Houston, TX