I recently bought a pair of Oakley M Frame SI Strike glasses (https://www.oakleysi.com/Product_Detail.cfm?id=97&sid=14&pid=1). I bought them at an Authorized Oakley dealer (The Eye Gallery of Destin). They are signed up for Oakley warranty now. Looking at them closer, I have my concerns on authenticity and I would like to get you guys' opinions. A.) My dad has a pair of M-Frames, not the SI military edition like mine. His has the SKU # etched into the side of the frame. Mine doesn't. I'm under the assumption that because they're standard issue, they don't have SKU etched. I would like some input as to whether I'm wrong or not. B.) My dad's M-Frames have "Oakley" etched on the lens. Mine does not. I am curious as to whether or not that says anything about the authenticity. Any input would be appreciated! Thanks in advance!