Why are you asking for a NAFTA when I have already put it in with the invoice on the outside of the box when the courier picked up the goods?

We are often asking for a NAFTA even though you have included this with the documents when goods are sent out by courier because, in many instances, the courier pulls the documents from the box(es) to hand over to the broker, but does not surrender all of the paperwork. We often receive only the invoice.