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WARNING: When you delete an item in Box, the item is moved to your Trash and remains there for up to 30 days allowing you time to recover the item. After 30 days, Box will remove the item from your trash and mark it to be permanently deleted after 20 days allowing you time to submit a ticket to have the item recovered. After 20 days, the item is permanently deleted and unrecoverable. Each item in the trash folder will show you the date it was deleted and when the 30 days will expire.
There are several ways to delete files and folders individually or en masse.
To delete a file or a folder:
- Right-click or click the ellipsis (...) on a file/folder and then click Trash. Alternatively, you can click next to the file/folder name to select it, then in the upper-right click the trash icon.
- Box moves the item to your Trash folder and displays a confirmation message. You can undo the delete action by clicking Undo in the confirmation message.

To delete multiple files and/or folders:
- Select the items you'd like to delete by pressing and holding the Shift or Command key and clicking next to each file/folder name. Press Shift to select everything between the first and last item. Press Command to select multiple items individually. Selected items are highlighted.
- When you have selected all items, scroll to the top of the file display and in the upper-right click the trash icon.

For more information, see the original article from Box here: https://support.box.com/hc/en-us/articles/360043696634-Delete-Files-or-Folders.