I didn't take a picture of it, but it is these odd looking tabs on the rear doors on the very bottom rearward part. Is that the place where the wings connect?
This has been asked and some think it is there as some kind of protection for the bottom part of the door edge/corner or chip guards. http://priuschat.com/forums/gen-iii-2010-prius-main-forum/67489-what-heck-these-2-things.html http://priuschat.com/forums/gen-iii...ecal-supposed-removed-during-dealer-prep.html