...
To enable Box Sync on any folder, see How to Get Started with Box Sync Syncing files to your Computer using Box on the web.
Accidentally deleting folders
If you accidentally delete folders, the person who deleted the folder or the folder owner can recover the folder. See Recovering Deleted Files and Folders for additional information.
Recovering Deleted Files and Folders
...
From the Box website, click on the All Files dropdown (
) menu and then click on Trash. Alternatively, click on your Name at the top right and then click on Trash.
You'll then see a list of everything that's been deleted. You may use the checkboxes (on the right side) to select multiple items and then click on the Restore button to restore the files or folders to their original location.
...