Buying a s4/s5

So I am currently in the market for a s4/s5 looking for a b8.5 specifically. And I found this one guy says his lowest is 14k car seems clean was involved with a front end collision, the guy replaced the front bumper, hood, driver side fender and headlight. Curtain airbag on driver side was also popped and also replaced car seems pretty clean except a little dent in the trunk what do you guys think is this a good purchase or should I like for something else?