You are worrying way too much about nothing and wanting to piss away money for no logical reason whatsoever.
Odds are nobody even notices or cares. Rental companies to live in reality and know that cars suffer normal wear and tear. What they care about is if you actually went and scratched the car or scuffed it against something or were in a proper accident as that’s a liability issue for them.
In all my years of rental cars I have never had an issue returning a car from any brand of rental agency…at least the ones big enough to be at airports.
Unlikely you even caused that, it looks pretty old and that would be my argument if someone did highlight it.
Is this your first time renting a car? Is that the reason for the anxiety about all this?