What did Mij do to the box?

Maxwell had put Mij in the box and left for a meal. When he came back, he saw a horrific spectacle. There was complete silence from the box. However, from its airholes and chinks around the lid, blood had trickled and dried. He took off the lock and tore open the lid. Mij, exhausted and covered with blood, whimpered and caught his leg. It had torn the lining of the box to shreds. He removed the last of it so that there were no cutting edges left.