No, I personally haven't, but I sold some Coco to a gal on eBay who had been ripped off three times purchasing Chanel scents. She had written prior to buying, asking where I'd gotten the bottles.
Since I still had the sales receipts AND SAKS BAG, we were able to complete the transaction. Made me wonder if she shouldn't have the dept. store route in the first place, considering the waste of money.
There's always a good discussion about fakes on the men's side.