Lucky BrandMen's 181 Relaxed Straight Leg Jean in Ol Night Shift

I just receive my jeans and they do not appear to be authentic lucky brand,how can tell for sure the jeans i received are not knock-off?

are these 100% cotton as in no elastic/ stretch ? i have been looking in stores and everybody is only carrying jeans with stretch

does this have two belt loops in the back?

does it have two belt loops in the back?