Yes - the Service Label (in effect the RPO list and paint/trim ID) is fixed inside the glove compartment, Stephen.
Not the easiest place to read the details - take a torch if you're inspecting a C6.
Ask away if you want any more details. I realise we're separated by the English Channel, but if want you to look at an original. correct 2007 C6, you're welcome to
check mine out any time! (Everything is a la Bowling Green bar the exhausts, which are stored in my garage; the car has been fitted with a Magnaflow system).