I'm still assuming it's in your contract. I guess everyone has just thrown in the towel and are afraid to push. That's why all of you are delivering them, without help. After pushing, threats in the office, and letters - we agreed every morning I would go out to my car and point out the over 70 lbs packages. They pulled them all off my car, every morning. I didn't deliver them for years. I was the only one in my building who didn't deliver them, as far as I know. Guess what they did with those packages? They gave the packages to drivers who wouldn't say anything and just deliver them. Those drivers would normally say something like; Aahh, it's not so bad.
You and the preloader handled that package wrong.