User blog comment:IamJakuhoRaikoben/Chapter 392: I Must Not Forget, Review./@comment-1776824-20140711185703/@comment-7418318-20140713202142

That's most likely a bad translation. Mangastream as it as "In the rubble..." which makes more sense. Silver was probably surprised that Gray could unfreeze the ground in this spot that's seen in the next frame and pick something out. Remember that Silver up to that point believed that it was Natsu who thawed the Sun Village and that earlier he seemed very sure that Gray wouldn't be able to use any more of the rubble because it was frozen.

But putting that aside, if Cube really had crashed on top of that grave, there wouldn't be anything left of it for Silver to recognize and why would he say "the ruins" to a grave that was shown to stand all by itself with no structure in sight?