does anyone know how to get imfo on a past case?

Is this related to your own injury or someone else's? If it is someone else's, you don't have a right to that information. If it is your own, you can contact your employer or the insurance company that covered your injury. Of course, companies are only required to hold onto information for a limited period of time. If it is an older injury, the chances are better that the insurance company has the information.