Hard and almost impossible to say. Places like that will buy pallet loads of sometimes discontinued tiles , factory over runs and slower sellers. Some times its factory 2nds or ( builders grades) . Any brand name they might buy is often private labeled just for them . Sometimes looking at the tile I can tell or sometimes the box style can give it away . There are on occasion markings or initials on tile backing that will give away the tile manufacturer. If you get or have a pc and want to try and find out, send me a pict ,front and back, I might be able to tell from that. E mail me thru my avatar and I ll send you my regular e mail GL
