Section 9--501(A)(1). By using: (A) the file number assigned to the initial financing statement to which the record relates and the date and time that the record was filed; and (B) in the case of collateral which is a cooperative interest, the real property tax designation associated with the real property in which the cooperative unit is located as assigned by the local real property tax assessing authority; or (2) if the record was filed in the filing office described in Section 9--501(a)(2), by using the file number assigned to the initial financing statement to which the record relates

(b) Destruction of written  records.  Except  to  the  extent  that  a
  statute  governing disposition of public records provides otherwise, the
  filing office immediately may destroy any written  record  evidencing  a
  financing  statement.  However,  if the filing office destroys a written
  record, it shall maintain another  record  of  the  financing  statement
  which complies with subsection (a).