Dario,
He clearly is not interested in helping you. Just open a case as soon as eBay lets you. Upload your pics and why you believe they they were misrepresented. Believe it or not, eBay sides with the buyer 9 times out of 10, unfortunate for good sellers who get a dishonest buyer, but warranted in a case like yours. I think they are afraid to lose buyers, which is why they do this. Worst case, you will have to pay to ship them back to him. If you do use a priority mail regional rate box A from us postal service. Should be able to get delivery confirmation with it & I believe they come with free insurance up to $100 now too if he would claim it arrived "broken". At any rate, good luck with your case.