Opel Tigra, Clio etc.

Hi, I would like to see this car tomorrow or the day after tomorrow:http://suchen.mobile.de/…/204032539.html?… There would have been a small dent in the back, which he can pull out. It would be possible to have a guarantee. The checkbook is available but has no entries. Service was made at free workshop (without stamp). KM-Stand is original and condition, seats etc. correspond to that according to the dealer. What do you say? Should you have it checked by TÜV/Dekra? Here is another one. I don’t know about the checkbook. Should I call: http://suchen.mobile.de/…/205796093.html?… Is a warranty for 12 months at all reasonable or worth the surcharge (about 250 €)? 6 months the dealer must stand for everything anyway. Greeting Lena