There's a lot of information on your users and content in your Box account. Using reports in the Box Admin Console, you can see details on key areas such as external collaborators, user activity, or see a full folders and files report, among others. Check out this Support article on Running Reports to learn more and see all of the reporting options.
You can also schedule a report to run at a cadence of your choice or add subscribers to specific reports to keep other team members in the loop.