Even then, you need to authenticate the bag first. So, unless they are pre-owned or from an older series being sold by a seller, do not trust the reduced prices. Other interesting trivia – if you look closely, you can easily spot a fake.
If the finish of the stitches looks sloppy, count them on either side, and that will give you a clear picture. Even at the crevices of the handle tabs, the number of stitches on the bag are exact on both the sides of the handles. Stitches on LV bags are even, regular, and consistent.