I am not a seller - but a buyer of sometimes questionable  items.

OMG, that came out wrong!

You all know what I mean.

That is why I have spoken to Ebay quite recently about the event that something may not be authentic and this is how it works maranook:

There is no way that Ebay will instantly take the buyer's word - without a proof.

In the case of Chanel especially - as the fact that items were able to be listed, stay listed and sell without Chanel taking them down is almost a guarantee in itself. But if not, the buyer still needs proof - their opinion alone doesn't count for anything.

And they most certainly (or so they say) ever tell the buyer to keep the stuff and still help themselves with the seller's money.

If there is ever any ambiguity about anything - they refund the buyer, not the seller. Seller gets to kip his money and buyer then doesn't need to return the item.