(1)    Postlapse maintenance and retrieval of information. The filing office shall maintain a record of the information provided in a filed financing statement for at least one year after the effectiveness of the financing statement has lapsed under s. 409.515 with respect to all secured parties of record. The record must be retrievable by using the name of the debtor and:

      (a)    If the record was filed or recorded in the filing office described in s. 409.501 (1) (a), by using the file number assigned to the initial financing statement to which the record relates and the date on which the record was filed or recorded; or

      (b)    If the record was filed in the filing office described in s. 409.501 (1) (b), by using the file number assigned to the initial financing statement to which the record relates.

   (2)   Destruction of written records. Except to the extent that a statute governing disposition of public records provides otherwise, the filing office may destroy immediately 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 sub. (1).