Scratches when buying a car not specified

Hello out there, we picked up today the used one of our choice from the friendly dealer. Unfortunately then in the evening we found at the car look at the tailgate semi-professionally probably mt a paint pen repaired paint scraper. These scratches are not really disturbing, but they were neither presented to us by the dealer, nor found at the service review and listed in the corresponding booklet. Is this the responsibility of the dealer to remedy this? Greetings Mark