So I purchased these Ray Ban off of eBay, they seem to have all the authentic features: the Ray Ban etched in the right corner of the right lenses, the little RB etched in the left lenses, the Ray Ban logo sticking out of both sides on the arms of the sunglasses. The glasses are in great condition, seem like they are made with genuine products. I purchased these for $32...since it was an auction. The numbers "RB2140 901 50 22 3N" is written in the inside of the left arm. The words "WAYFARER Hand Made in italy CE" ( the E do not look like the letter E it looks like the actual symbol). I searched many of the Wayfarers and they all seem to have their own distinctive attributes based on the models and type, so it is making it really difficult to know weather these are legit. FYI some pics are a little blurry) http://s954.photobucket.com/albums/ae30/Sunshine_Chick/?action=view¤t=CIMG0930.jpg http://s954.photobucket.com/albums/ae30/Sunshine_Chick/?action=view¤t=CIMG0931.jpg http://s954.photobucket.com/albums/ae30/Sunshine_Chick/?action=view¤t=CIMG0933.jpg
There should be a recycling logo, as well as a semi-permanent sticker on the box, including the serial number, manufacturer and distributor details, lens and frame type, and the model number of your specific style of sunglasses. If this sticker is missing, the sunglasses in the box are probably not genuine.
Try holding up the sunglasses and check the engraved "Ray-Ban" logo, which is an interlocking RB etched in the lens. If it is above the hinge, your Ray-Bans are authentic. If the engraving appears below the hinge, they are probably fake.
Try checking the rubber quality on the earpieces and frames. Quality rubber is used on authentic Ray-Bans and should feel chalky to the touch, not sticky, stiff or slick.
From your photos, i believe these sunglasses to be in check. They are most likely authentic.