In my experience, you know they are Ringle ones when they go...creak...snap.
But on a more positive and less cynical note, they look like it to me. There was another company making them look like that once though. Just the one I seem to remember and the modern X-Lite ones arent really that similar.
By the looks of them, those are replicas of the Ti-Stix titanium models.
Not really worth of anything and I can relieve you of those so that you don't have to worry about them anymore. And remember, owning counterfeit is a crime!
There are no marks per-se to indentify real skewers. The three holes was the branding, and I must admit, I haven't seen aany 'fakes'. Ti stix versions with the ti rods have the backs machined out. The regular stainless/ cromoly rods didn't have the backs of the levers machined out. There were some models that were ti only, such as the gold coloured jobbies, and the ti-stix road, that came in black or silver, and had one long slot rather than the 3 holes. Looks like you have a set or 3-D Violet Ti-stil, the most desirable of the lot, worth at least £50 plus. If bone of the skinflints here will give you what they're worth, I suggest the bay