So maybe these dudes are A OK but who are their friends?
Define "Automotive Wire". I doubt if that is an exclusive use.I doubt that wire has a nefarious purpose. You can buy more than enough wire to build bombs or whatever at the local Radio Shack.
One possibility, however, is that they had a truckload full of innocuous stuff that they take to the port and unload, and then pick up something to take back to MI or wherever. So if I were the FBI, I'd be looking very carefully at the contents of every container and every ship in that port or coming into the port in the near future.