It looks legit to me but the only way to be sure is to look at the RPO codes, Z4C will be listed as the LE package. The rear valance only came with the center mount exhaust, this car has the dual/dual exhaust that was available as an option from SLP.(My car has the same exhaust as part of the 345 HP Package)
P.S. If you are interested in buying that car I would try to talk them down a bit, I got my car in Jan with 23k miles for $17.5k.