The second time I rented from National I got a new Grand Am, about 1000 miles on it. I glanced at it in the garage, didn't notice anything and left. When we got to our grocery stop and got out, we noticed that the back right tail light was broken in the corner and a large scratch next to it. It looked like someone had backed the corner into something. Since it's dark in the garage I didn't notice it there but in full daylight saw it right away. I called National when we got to the resort and reported it, probably about an hour after picking it up. They said to mention it when I dropped it off. When returning the car, I mentioned it to the attendant and she would not give me a receipt saying I had to go to the counter. I had to go to the counter and fill out a report, I said I did not do it, it had to have been pre-existing. I never heard anything more about it, I assume they took care of it.
Now whenever I rent a car, I go around twice and have whoever is with me go around too! I always use a Gold Visa so there is coverage there. The Visa is usually secondary to your regular insurance, they will pay the deductible and your insurance the rest.