I don't know how, but scammers are prevalent on that site. I feel most pinsiders are overly cautious to a fault, however, I would be cautious on that site. I even had someone send a picture with a piece of paper on that glass with a date etc after I asked. Must have been a photoshop. Easy dead give away is trying to call them and you get a google voicemail or they call you back later. They are always out of the country Nigerian types and there are always pauses during the communication and their English sucks. They are also really pushy. Tell them you have a buddy in the area that wants to check it out in person. They'll make excuses. Run.