Sell them in a lot raather than invidually. Utilize the flat rate shipping boxes and create listings that will fit into those boxes. Or just sell them here in the Marktplace.
I would call this number 866-540-3229. This should get you to a live US representitive, explain the situation and they will ask you to submit the pictures to them. I would say you have very little chance winning against a refund request unless you call.
Sorry to hear that Ian. I try to ask every time I buy boxed games, but soetimes I forget and a surprise like this arrives. Whenever this comes up in the forums I think of the Minty Guardian I purchased for $450 and the seller just slid it into a manilla enevelope and shipped it. NOT a padded envelope, just a plain envelope with not a lick of protection at all.
seller has been doing it for years, always the same story, rude,and fake carts/manuals. This isn't a replacement cart, I would bet money it is a Hozer cart.