67mustangs

Hi, A am looking at getting this nice '07 mustang I found on Craigslist but I am not sure if it is worth it. We agreed on a price of $5800 and he said I could take it into a mechanic before I pay. It was listed as fair condition but he said it was only cosmetic. There is a crack on the rear bumper near the side light that is about 6 inches long and the light is only held on by a couple screws. There is also a dent on the side by the bumper. Other than that it looks good. If I cant get pics on here ill try to get them in a comment. I want to keep it but I am also looking at retail value. What do you think I could get for it? Thank you for any feedback!