I'm sorry you have a lot of problem for a few Contact-Kits. Unfortunately we don't have the FDA approval so I can't help with that. I don't understand, it is not Pulp testers but just the ground lead as mentioned in the description. Have you told them that they can open the parcel to see it is just a wire and not a electronic product? I can also send you a revised invoice if it's still relevant.
As mentioned earlier, we do not sell that many of these contact-kits so we only have a 6 pcs. left on our stock. It will take a couple of days before we have produced some more. So I will suggest that we send them with DHL to your home address as stainless steel metal design sample, to be sure that you receive them before the 6th of December. But I have to invoice you again and if we receive the first ground leads back, we can credit them on you next invoice. Is that ok?