We have released a new version of Box for Salesforce (v4.16), available for download at the Salesforce AppExchange.
Included in this release:
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Users can select and send multiple documents for signature from Salesforce
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In “Box Sign Display Settings", the “Pre-fill Tags Settings” now has a “Copy” button, so Admins can easily copy/paste the tag into a Box Sign template
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The “Assign Box Permissions” Flow is now an active template that can be modified
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In the Box for Salesforce, Salesforce Developer Toolkit:
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The Generic method can now call upload.box.com endpoints, instead of only api.box.com
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The Create, Read, Update, and Delete (CRUD) methods can now read and write custom Box Metadata attributes including non-text attribute types
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Box UI Elements now supports Box shared links
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Fixed assorted minor issues
 
Note: Box recently released enhancements to its public collaboration APIs, which will break older versions of the integration (v3.54 and lower). Therefore we strongly recommend:
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For all customers using Professional Edition, upgrade to v3.56.
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For all other customers, upgrade to the latest version of Box for Salesforce, as older versions are no longer supported.