I would check the seller's feedback as well to make sure there is no bad feedback for selling bogus.
Most of us here are selling authentic vintage, but your concern is why we flag the bogus when we see it.
We do a lot of research or are personally knowledgeable about what we offer for sale, look at the descriptions for decent details, and most of us do show the bottoms of vases, planters, etc., if it's marked.
Good luck, but be careful....I started out as a buyer, and before you know it, filled my charming little bungalow to the gills and had to start selling, too! :D