Notice of levy under § 21-19-3 may be served upon the debtor or his attorney, or if the debtor is not represented by an attorney of record in the action or proceeding and if the debtor cannot be found within the county where the action or proceeding is pending, the notice may be served on the debtor by registered or certified mail addressed to the debtor's last known post office address.
SDCL 21-19-4