Box Thrown Down Attic Steps

My cousin was in our room straightening up her things and she heard loud banging noise behind the attic door, something being thrown down the steps. She yelled and I went up and she told me what happened. I opened the attic door and found a box that was on the front side of the attic, placed back midway from the stairs was thrown down the steps. It was right at the attic door when I opened it.