Install box as an external LTI app

Follow the normal procedure to add Box to your course via Settings->App.

Search for Box and then paste in the URL. 

Search-for-Box-app-20170208-cropped.png

This will take you to https://www.eduappcenter.com/apps/221# Links to an external site. where you must click the button to generate a key (which is placed in the consumer key field) and a shared secret. Add these values to the configuration.