QUOTE(MaxReddevil @ Apr 19 2010, 05:49 PM)
OMG, i just received the reply from the EBAY seller regarding the refund. I told him that i wanted to open a dispute with EBAY for safety, but somehow, he is not willing to. His reason being that i was wrong cos he agreed to give me a refund once i post the jersey to him and that his thread in EBAY did not mention any authenticity of the jersey. So he said it is not necessary to open a dispute

To be honest, if you open a PayPal dispute by claiming that the shirt is fake, its really really difficult to win the case because you need third party verification letter as a prove, that is the brand owner, and it will be a pain
Try to keep the message exchange between you and him which contains he agrees he is not selling authentic stuff, it might helps you.
eBay strictly condemn and against selling fake, but they might not take proactive action on this issue, they only act when the right owner complain to them.
You have to told him that by open the dispute, both of you have some kind of protection between each other. You as a buyer's will worry whether he will refunds the money after he received the shirt, he as a seller's will worry whether you will send back the shirt after he refunded to you. So the best way is by opening a dispute and let him agree to refund your money after he received the shirt. Isn't that a compromise?
Good luck!!