I can see some similar molding marks here but not that deep.
I dropped mine the other day and it landed on the corner. The shoulder button pushed into the case, but no damage done. I had to loosen the screw to pop the button back out. The shoulder buttons are like a crumple zone in a car.
Interesting, I can't remember my prototype cases breaking at that location.
Other parts of the housing broke quite frequently, so maybe that took away the stress of that part and we did not see this happen before.
When I saw this thread, I thought to check. Mine has cracked in the same spot. I'm not too upset, this is a product made by a very small company and I'm sure they're doing the best they can, they don't have the resources to do as extensive of testing as a big company. I'm sure ED will be able to help us.