If car donation receipt states allowable is $500 and KBB Private Party Value mid is $1,273, must Form 8453 be w/ my Return? No 1098-C issued by Donation Foundation.

No info was provided re: amount car was auctioned for. I thought the Donation allowed was for the present value it held. The vehicle had low mileage for it's age and in Good physical and mechanical condition.  Low value is $837 to High value of $1706.