I am about to ship 33 boxes of dvd cases to a business and am not sure if I need to secure them to the pallet. I just stacked them up on a pallet (825 lbs, 46 L 46 W 46 H) and wrapped a lot of stretch wrap all around. Do I still need to attach the shipment to the pallet with some sort of straps? If so, can I get those at home depot cheap?