Every state has different Lemon Laws but essentially, if they can’t fix it after multiple attempts/days in shop/other factors they label it a lemon. Sometimes it’s not so clear and there is a push between the dealer/manufacturer and owner.
From my experience manufacturers actually tend to be quite picky. Especially MB because they turn around and sell every RAV at auction. When I facilitated RAVs with Land Rover I had an extensive vehicle condition checklist to do (made me note all wear and tear).
Hard to believe they will want to screw you on the scratch while buying a lemon after all you went through dealing with this, plus having a wear and tear protection.
Add black tape/decal to the entire lower front bumper and say it’s for protection and looks. You could do that to the rear too, just to sell it. I doubt they will remove it to check, while you’re returning the car lol