I think you are entitles to $3500/$4500 plus the dealers best estimate of the scrap value of the car -$50 administative fee.
It has me wondering, if you could get the $3500/$4500 and then not accept the scap value and get the car back after the engine has been killed?
http://forums.audiworld.com/showthread.php?p=23832913
Here is an example of an Audi which has a very high value in the sum of it's parts. Has anyone heard of such a thing?