Suregrip Marks????

I pulled my pumpkin out a while back and have been meaning to post this. After I pulled the pumpkin I saw marks on the locker. There weren't any shavings in the fluid or anywhere on the third member. The gears look good and there are no signs of wear on anything. I didn't set the gears on this and were there when I bought the Dart. The only thing I could think of was maybe the previous owner wiped out a set of gears? Anyone know what would cause this?