My personal opinion on these cases (assuming the OP team is still reading and looking for opinions), is that finish coloration, uneven edges on the back ports, and even a tiny sinkhole is okay. If that's it, ship it.
If the issue is actually functional regarding the hinge, or that the cases will come out beat up, torn or scratched, that's just too much to overlook.
If the issue is actually functional regarding the hinge, or that the cases will come out beat up, torn or scratched, that's just too much to overlook.