From 2005-2007 I worked at UPS. Pack your package in the best possible way and/or order the best insurance you can afford because when you have 3000 packages coming at you an hour, no one there cares how carefully you get your job done. They only care if you keep the back up bell from going off so packages don't have to cycle around the bay anymore.

I have seen people steal minor stuff too, but from major corporations. A middle aged woman opened up a box of Fruit Rollups and scarfed one down as she was loading.