I ask this because the recent posts about staggered 20" wheels has made me want some too...

The local classifieds had a post for a set of 20" 87s with staggered Diamaris for only $1000. Seller claims they are $4000+ NEW. The items sold within days.

In case a similar opportunity presents itself, how does one tell if the rims are original BMW of if they are replicas? The above price looked like a really good deal for originals not so for reps. What markings if any do I look at to avoid getting ripped off?