Buying anything online can be a crap shoot. Even big online retailers like Amazon can send you something that isn't quite what it said it was online. At least with Amazon Prime it only takes two days to realize your order is screwed up though. Once you get into private sellers, you have a whole other list of problems. Like them luring you into an alleyway to murder you. Or more likely, that they're not being 100% truthful.
A keen user in a Facebook group didn't need glasses to see there was something up with this ad for some brand new specs. They claim to never have been worn, yet we can clearly see them being worn in the seller's Facebook profile photo. Dude, I know that picture is one of your best selfies, but it's not going to help you sell those glasses.