How to know if a coach purse is fake? No purse?

I know some Coach handbags have serial numbers recorded and all that, but the portfolios not have serial numbers on them. Such as France coach Hamptons Purse New http://www.coach.com/content/product.aspx?product_no=8935&category_id=73

usually the seam pockets and full wallet itself is really bad. as will be neglected or when certain things are sewn to be crooked.