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POPSHow the Value of Your Car and the Cost of Repair are Determined You can argue if you believe the pieces of the car are worth more than they were when they were actually part of a whole car. If you believe you are entitled to more than the book value of your car, you will be required to submit documentation that will include any service history records, and affidavit from your mechanic testifying to your car's worth and any other evidence like mileage records and receipts for custom modifications.