box_delete_file moves a file to the trash folder.
box_delete_folder moves a whole folder (and all of it's
contents) to the trash folder.
box_restore_file moves a file from the trash, to wherever it
was before
box_delete_folder does the same thing for a folder.
box_delete_file(file_id)
box_delete_folder(dir_id)
box_restore_folder(dir_id)
box_restore_file(file_id)boxr_file_reference.
box_ul, for putting files there in the first place