(2) The treasurer shall send a copy of the first of the four published notices by registered or certified mail to both the owner of the real property to be sold at the last-known post-office address of the owner or place of residence and to the occupant, if any, of the real property to be sold. The treasurer shall also send a notice containing the same information required in a published notice under subsection (1) of this section by registered or certified mail at least 60 days prior to the sale to any person requesting notice under ORS 86.806 and to any person having a lien or other interest in the real property to be sold if the lien or interest appears of record. The treasurer shall retain and file the return receipt for the registered or certified mail. [1977 c.403 §2; 1985 c.231 §1; 1991 c.902 §58; 2009 c.510 §5]