I was looking at a very well priced 535 x-drive GT. The carfax was clear, but I was curious that the car only had 1500 miles. I did some investigating, and found that the car was sold by a dealer in the Chicago area and was a BMW buy back. I do not know exactly why, but, my BMW dealer did some investigating and said that the car did have some repairs done the tailgate and bumper. When I confronted auto xchange the story they gave me was yes, there was some body damage, but it was before the car was initially sold and that the reason it was a buy-back was that the customer found out after the fact and was angry, and BMW took the car back. Again, I went back to my dealer and he said that was a complete fabrication. The car was delivered clean, and the repairs were done several months after the care was purchased.