Most customers use Box as a system of engagement and SharePoint as a system of record and final disposition.
In other words, use Box for content creation, sharing, mobile access and integration. Use SharePoint for things like records management and custom applications built on the SharePoint platform.
When you get ready to launch Box to your organization, make sure you provide ample training and support and communicate the new expectations. If you would like a sample launch template, open a new ticket with your request.