Correction, 12/12 today, I found a shell-less egg below the roost tonight, it was leathery, but not broken. I just cooked it up and ate it along with three normal eggs - delicious!
The butt nuts are coming thick and fast. I got 3/4 today and 4/4 the two days prior. One hen has laid two double yolked eggs and a single yolked one. Pew pew pew.