As mentioned, the pad is available at Ford parts.
It appears when the dealer details the vehicle and removes all the cup holder inserts, charging pad, console pad, mats, etc., they sometimes fail to replace them. So, the best advice, when purchasing a 4th gen Expedition, is to inspect to see what's missing. Mine was missing everything and the dealer provided all the new items, when I brought it to their attention. I find my charging pad useful when I use wireless Android car play. It helps keep the battery charged, since the car play drains it on long trips.