I have switched back to crop cameras from my 5D, so this lens is no longer needed. It is only 45 days old, and it is like new in box. I used it twice. The box has still has the UPC, and I have a receipt dated 3/30/07 from Allens Camera, and the blank warrantee.
I paid $589 for this lens, and am looking for $525 paypalled and shipped.