I don't know if this will work, but I put this in the beginning of my designer auctions now: "NOTE TO EBAY - This is an authentic Chloe auction. Please do not cancel this auction. I have the receipts, etc. Please ask me to provide you with copies of those before cancelling the auction. You have been indiscriminately cancelling auctions from very good, trustworthy sellers. When potential buyers see that an auction has been cancelled, they make certain assumptions that the seller is engaged in the sale of counterfeit goods. Please ask before you cancel the auction."
You might want to try this.