The job duties of a law office runner involve delivering messages and legal documents for a law firm. In addition to your courier responsibilities, you may also perform typical office clerk tasks, such as making copies, organizing files, and organizing and distributing mail in the office. You can pick up and deliver documents to a courthouse, law firm, or client on foot or using a personal vehicle. Many law office runners also do other errands. Your supervisor may ask you to pick up office supplies or buy coffee or food for other members of the office.