True.
All I have to go on for Peltier is that their known early hand-gathered slags - the Cerises -- don't have the 9-pattern characteristics. Don't think the Prima Agates fall into the slag category, but the few of those I've seen don't either. And, of the few early slags recovered from the Pelt site that I know of, neither do they. Others may have examples, though. Love to see them if they do!
And HG CACs of any description are so thin on the ground, I tend to discount that ID almost automatically.
My personal opinion -- as applies to me only! -- is that the vast majority of American nine-and-tails are MFC (except red ones), and the random-patterned ones are all Akro, unless something jumps out and hits me on the head that they're not (like, they're still in their original box!). Odds are.
Hansel has a noteworthy collection of original boxes. Wonder if he has any observations -- Hansel?