Yes, by the inside of the back panel, the dent was under the rear window, so it's part of the body and not of a removable part (I have the 3 door).
I checked carefully the inside, nothing loose and no mark of screwdriver.
It looks very clean so far, I'll check regularly to make sure.
They anyway have a workmanship warranty.
They are Audi approved and one of the two or three in Gauteng also approved for the R8 aluminium bodies. Their techs are apparently sent to training at Audi Germany to be qualified on aluminium bodies, I guess they follow strict Audi guidelines.