Someone is selling me a brand new levi's 501 jeans at a cheap price. .. But i need to know how to find out if it's fake or not. Authentic Levi's jeans that are zip fly are those with the levi's mark on the zipper itself right? Or is there anything else i should look for? How about for button fly jeans? How do I know an authentic Levi's 501? I really hope someone can help me on this... Thanks!!!