Arghhh. I've just been out to check mine and it would appear I have replicas. Mine clearly have AMG stamped on them. I bought them in good faith on the basis that they were genuine AME rims.
To be fair though they're good replicas they even have MB part numbers stamped on them and orginal style rusty wheel bolts. I bet if I scratch the head of the bolt, what I thought was rust will turn out to be an orange/red/brown paint effect.