Not quite correct there about the resale cost of cars, this probably relates to a/c accidents too. In my previous trade as a spraypainter in the auto industry we used to do repairs on alot of european cars Merc and BMW and a few Porsche's, repairers have to be approved by the manufacturers and the repairs caried out as per a repair schedule put out by the manufacturers and they stand by them.
The resale on a repaired car would be more affected by general depreciation than due to a biff.
I would imagine that the insurance companies would not pay out on the repairs if Boeing were not happy with the repair that was carried out.