I dont know about anyone else who sells cards, but just had a caleb williams end up with a magical crease.
I'm not a professional grader, but I do have a loop. There was not a crease on the card. Card went from the pack, onto the light table, looped front and back (no damage), into a sleeve, into a hard sleeve, and then into a corner saver.
Unless their was mishandling of the card, there is no way this card could have been damaged.
Good thing I have pictures of the card and how I packed it.
Needless to say, I will not allow Ebay authenticators to touch another card of mine. If this means no more selling on Ebay so be it. I'm just glad I paid for the insurance.