Infectionitus

I found a cpo 911 991 with minor dammage reported on carfax. The car is $56,500 and has 20,000 miles, it is a 2014 911 991. The salesman told me the bumper was replaced and he does not know what caused the dammage but they wouldn't have been able to cpo it if it was bad at all. I would love some advice on if this car is a bad idea to purchase or not. What type of price do you guys reccomend is a fair price to haggle down to if I decide to purchase this car.

The vin is:
WP0CA2A94ES140678