docs: @Override
  	public FAXSearchResult search(String corpNum, String sDate, String eDate,
  			String[] state, Boolean reserveYN, Boolean senderOnly, int page,
  			int perPage, String order) throws PopbillException {
  		return search(corpNum, sDate, eDate, state, reserveYN, senderOnly, page, perPage, order, null);
  	}