Fake bags also come w/ dusters these day so I wouldn't put it pass them. Maybe you can bring it Saks/ Neimans and get it authenticated? I'm not sure if they do it though...
how smooth is the leather. i have a real marc jacobs bag, purchased from off fifth. (the saks outlet) that's authentic and it has smooth leather. from a distance it looks really smooth and you can only tell close up that it has some texture. it's from a couple of seasons ago, and when i bought it they had several bags from that collection in different styles that had the same leather. i'm n/s if i keep the control card with the style # but i will search for it and post the info. if you want.