So it's possible something other than Libitina and her master could've done this?

[Takes a few steps back and turns slightly so he's standing with his back half-facing the brothers, wary grey eyes scanning the area. Since there isn't much he can contribute to the investigation, Allen figures he's more useful this way ― whatever made those marks, there's no guarantee it isn't still hanging around.]

[ in reply to Rin: ] I'm seeing more. [ he pauses, pointing out a few scratch marks scattered here and there ] Whatever it is, it seems to have gone through the entire place.