And you know this how precisely? What...you don't think chop shops ever do charitable stuff?
If the chop shop donates it's services, it still does not change the market value of the car at the point it was donated. The chop shop is adding value to the vehicle by disassembling it, preparing the parts for resale and storing and marketing the parts. If they do this out of the kindness of their hearts, the chop shop has made a donation to the charity, not you. The value of the car you turned over is the value of a fully assembled car. For you to report the value of the car parted out is false, because that is not what you turned over to the charity.