Yes as you might expect I called CookShack.
They returned my call today and the answer is.
Yes there is a flat on the gearbox drive shaft.
I was able to loosen the Allen screw in the collar enough to slide it up out of the way so I could see through the hole in the auger shaft. Then I was able to turn the drive shaft so that I could find the flat, slip the collar back down and tighten things up.
It's back together and time will tell.