are these lenses OEM?

[DecOakley]

 

[flyer]

Pretty much impossible to say for sure.
Both Oakley and the aftermarket used a Grey base for their Reds AFAIK.
IF it’s the same thickness as a known OEM lens, it’s a good sign, as some of the aftermarket offerings are noticeably thinner.

 

[mjt42]

The serial number in the inside of the left arm can give us a clue - although not a definitive answer.