Ok, my smart cover made a scratch on where the magnets meet or whereit snaps, it looks like a debris was stuck between the smart cover and the ipad.. Too badalthough its very small scratch.
Is it a scratch, or perhaps some graphite powder? Mine does the same, as in after a few days use, it looks, as if there is a scratch, but then it's powder coming from the hinge, which can be washed of easily.