code: public BoxRequestsFolder.DeleteTrashedFolder getDeleteTrashedFolderRequest(String id) {
          BoxRequestsFolder.DeleteTrashedFolder request = new BoxRequestsFolder.DeleteTrashedFolder(id, getTrashedFolderUrl(id), mSession);
          return request;
      }
docs: Gets a request that permanently deletes a folder from the trash
  
  @param id        id of folder to delete from the trash
  @return      request to permanently delete a folder from the trash