I'm sorry, but we are getting into semantics, here; for years, we've had the argument that the mats never existed. Several eye-witness reports have persuaded many that they did exist, with those refusing to accept the idea clinging to fanciful notions about raw materials availability (or not.) We now have a not-so-subtle shift away from "They never existed" to a grudging acceptance, but with a need to argue about the material used. Quite frankly, who cares? If the mats existed, they existed, and would have been used; anything that follows is argument, for the sake of argument, and is nothing s