Rear camber issue

#1
So about 6 months ago I noticed the passenger side rear tire has a lot of negative camber (driver side also has negative camber but not as bad). I took the vehicle to a local tire shop and also to a Toyota Dealer. Both told me the rear camber could not be adjusted. I have already replaced the rear tires once and currently rotating tires about every two months. The car runs perfect and has never been in an accident.

Any ideas what would have failed in the rear end to cause this to happen? I open to anything at this point.
 
#3
This car rear wheels has no camber setting but it usually happen if you use wrong size bolts while doing the shock job. Have you or the previous owner did any maintenance on the rear end? check if the rubber bushes are in good shape?
 
#4
Thanks for the info....As far as I know there has never been any work on the rear of the car. I've attached some photos I took when rotating the tires the other day. Not sure if anyone sees anything that looks out of place.
IMG_6010.JPG IMG_6011.JPG IMG_6012.JPG IMG_6013.JPG
 
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