You didn't lose a lot of time from work and it wasn't a serious injury. It was broken or anything so it seems pretty cut and dry. Not like a back injury, which they are always leery of since it's hard to prove and so often re-occurs. Does your company have a lot of WC accidents/claims? They're lawyers. They should know the law. If they fire you, they'd be in trouble. I doubt they'd be that stupid. The thing is with WC, you go to their doctors and their doctors want to get you back to work asap. Reports are often filed after the fact. I wouldn't worry too much about the time frame.