I just wanted to post this as a sample to learn from. If it's too good to be true, it's probably not and watch out for listing like these. Lens sell new for $5300 and it's listed for $2200 brand new. Poster didn't bother to post date code for such high end item.
In these cases you email the poster thinking it's a good deal then they'll reply with a message saying they'll send you a check to cash and you can send back the difference etc..etc..