The rear camber is adjustable on the inner bolts on the lower arms. They should have adjusted both adjustments to toe and casket to set them both simultaneously.
This is assuming that the rear camber adjustment is at the extreme point of adjustment of course.
As Tony suggested, the rear toe / camber value is set dependant on the height between the centre of the wheel to the wheel arch. Auto data book gives a look up table for ranges on this, and not a fixed value for all.
The fuel tank should ideally by half full and the boot empty.
Good luck fine tuning it