I am sceptical of the entire diminished value concept based on the statistic that the majority of vehicles over 4 years old have been damaged!
I am not aware of dealers reporting "damaged" vehicles as selling for less. I have never heard of a modern vehicle getting a higher price as being "undamaged".
This all assumes the repairs were properly done and restored the car to the mfg standards.
Having said that good luck with your efforts and let us know the end result.
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