I've scratched a few up in my day. It's hard to not see the closet auger push back, allowing the cable to hit the visible part of the trap when the toilet is full of human waste.
Keeping that rubber clean is important as well, as dirt from the bed of your truck, grease can be visible but removable... then lead to a complaint.
I've scratched up older ones but newer ones... I can recall one that I felt bad about.
Quit putting everything you shouldn't down the toilet and there's no need for a closet auger.