Sorry like yourself and eBay, no one can physically see the item  to check their authenticity if they are not an item to be sent to eBay's Authenticity Guarantee centre.

One clue is usually the price,  if it's sounds too good to be true then it usually is !😊

If you do proceed to buy the item I would recommend taking them to an Oakley dealer to verify their authenticity, and of course as you know,  you are guaranteed a full refund under eBay's 30 day MBG policy.

@ebygum333