EMPLOYEE STATED HE PICKED UP A BOX OF BOLTS FROM THE SUPPLY HOUSE & PUT THEM ON HIS SHOULDER TO CARRY THEM TO THE CAGE. WHEN HE ATTEMPTED TO LOWER THE BOX THE LOAD SHIFTED CAUSING HIM TO TWIST & CATCH THE BOX. HE SAID HE FELT PAIN IN HIS BACK. MANAGEMENT HAS DEEMED THIS OCCUPATIONAL ILLNESS, IF YOU HAVE ANY QUESTIONS ON THIS ISSUE PLEASE NOTIFY SAFETY.