Just remember. You're picking a fight with a adversary that can see everything.
What I mean by that is if you want to take on the company you better have your ducks in a row because the computer sees all your mistakes and doesn't forget.
Know the 340 methods and apply them. Know your contract. Know the safety crap. If you do not know these well then I suggest you use those 8 hours in the break room to study them and commit them to memory.
Don't try and get cute with the company. Saying things like you did opens you up to things you're not prepared for. Learn to smile and speak with a pen. Don't mix words with management just nod and file.
If you need the 340 methods you can find them here.
List of the methods
If you do not have your contract. Download it here.
NATIONAL MASTER UNITED PARCEL SERVICE AGREEMENT
Remember this isn't a war that you win and goes away. This is a constant fight and you should remember that everytime you think of taking a short cut. Because trust me your management team or labor manager will not forget and they have your whole career to try and make you pay for it.
Good luck and keep your head.