Right. The only reason they tell you not to file is because they don't want to look bad. I guess what had happened was an overweight came down on a belt without the overweight stickers and the person pulled a back muscle or something not knowing that the piece was overweight.
Regardless of what happened they are required to find a reason why it was the employees fault.
Tell the person to not give a
about them looking bad and file, if they wont file, ask for a steward and they'll let you file. The reason to file is to protect yourself in the future. For example, how long can it take for whiplash to show itself after a car accident? Its nothing against the sups, we just need to protect ourselves just in case.
Edited because i misread a post.
Editing again to say, when i say file, i was meaning file the report, filing a greivance in this situation is only needed if even after the steward is involved they wont let you file the report.