In some glasses, the hinges are attached with philip screws to tighten these.
Do all raybans have rb etching. Furthermore the logo should be etched onto the lens. Try checking for the logos instead. If the etching is missing, or a low quality or painted on the glasses will be fake.
If you order ray ban glasses they should always come with a branded leather case and cleaning cloth. If the etching is missing, or a low quality or painted on the glasses will be fake. On fakes the etching will either be missing or of poor quality.