I basically always tell people, if you’re buying Asus(in the U.S), youre essentially buying something new in box, but essentially considered used. Treat it as if its open box sale, because they will fight tooth and nail to attempt to deny your warranty.
Its a problem at various levels, primarily with the major Taiwanese Brick and Mortar companies. The sad part is how ubiquitous they are when it comes to the DIY portion of PC building.