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Once a folder has been moved to the trash, it will stay in the trash for 30 days by default before being purged. Administrators of Business or Enterprise accounts can alter the purge window. If you wish to permanently delete the folder from the trash before the purge window expires, make a DELETE request to /folders/:folder_id/trash using the trashed folder’s ID . 
curl -i -X DELETE "https://api.box.com/2.0/folders/4353455/trash" \
     -H "authorization: Bearer <ACCESS_TOKEN>"