Correct about the volute, but this damage sounds as though it is not your normal, if you could call it that, gibson headstock damage. It could be that the tuner was a little loose and when the user tune up time and again, it had caused the tuner post to pull back on the leading side of the hole, which in turn would put more pressure on that area, causing a stress raiser. This might have caused a small crack in the finish or the wood (hopefully not). This might be the small crack migrating out away from the hole. Should get it looked at though.