Seriously?
You're worried about a flaw that a CAMERA can't see?
It may be time to admit, as a community, that our stadards are a bit too high.
Use a light and you will see them clearly, and may be good enough to take a clear picture.
I believe that :appple: is experimenting with new materials to change the case design to have better grip and avoid this manufacturing variations with the plastic injection of this cheap case, even it has a coating to avoid scratches they have the cracks.
Meanwhile
