I have a MacBook Pro (Retina, 13-inch, Late 2013) 2.4 GHz Intel Core i5 4GB 1600 Mhz DDR3 Intel Iris 1536 MB. It has dents on the sides 1 minor scratch (not noticeable). 1 small crack the size of a 1" dot. I mean this computer has been through hell and back. So how much is this baby worth?