Dukan dar tw box kholne e nh deta. Jb tk purchase na kro. Tw box open kr k kese check kre ge. Or koi box open kr k check nh krwata. Showroom me display p tiles dikhaty h. Or wearhouse (godam) se boxes ship krwate h. Simple trick: every compnay already mension their tile grades on the box. For Example: prime (grade A) standard (grade B) Commercial (grade C)