Hi ​@Barb Flynn, 

Welcome to Box Community, and we’re glad to help move the contents of your departed user. 

If it’s your fellow co-admin who left the organization, you should reach out to your main admin to delete the user and transfer his contents. 

To delete the user, please follow this process: 

1. Go to Admin Console > Users and Groups 
2. Select the Managed Users tab
3. Click the user name
4. Click Delete User 
5. If the user owns content in Box:
   1. Select from:
      • Make user inactive. This is selected as the default option, and restricts user access and preserves their content. Use this option when a legal hold is in place, or anticipated to be applied to the user. 
      • Transfer content and workflows to another user, and then enter the name or email address of another managed user in your organization that the deleted user's content will be transferred to. Content left in the user's trash will also be transferred.
      • Delete user and their content to delete the managed user's content and workflows. (This option is not available if your organization has Governance enabled with active or retired retention policies, or if the user owns only workflows.)
   2. Click Continue
6. Decide whether you want to notify the involved users. (You can choose to notify the deleted user at the email address in their managed user account, and also the user that content and workflows are being transferred to.)
7. Click Delete User
8. If you use data residency zones and you are transferring content that will be moved to a different zone, click Continue in the Confirm Data Residency Migration dialog box

For more details in deleting users, please see this article. 

Hope it helps, and if you have questions please let us know.