Originality is king with special editions, and this one isn't.
Non original wheels, a rather dodgy looking exhaust and the line about being options from the dealer are pure fiction. Badged as a 600, mismatched number plate frames (the rear is wonky). Random AMG airbox (again, not original, but has value), but missing the cover in front of it. Incorrect bumpers (should be the earlier squarer ones), and I don't think it would have had Xenons either.
All combine to give the impression that a/the previous owner has been more about the bling than sympathetic enthusiast.
The red centres on the leather are looking pretty tired, definitely in need of recolouring. The drivers door lock isn't working, and there's no mention of service history. You can bet your life the Bonhams example was immaculate and with unshakeable provenance for that money.
Could be restored to full glory with a reasonable amount of work though.