THE EMPLOYEE WAS MOVING BOXES OF PAPER FROM ONE STORAGE AREA TO ANOTHER. HE REACHED UP TO THE 4TH SHELF AND PULLED A BOX OF PAPER TOWARD HIM. WHEN HE HAD MOVED THE BOX COMPLETELY OFF THE SHELF HE FELT A SHARP PAIN IN HIS LOWER LEFT BACK. HE DROPPED THE BOX AND FELL TO THE FLOOR.