When a lien is placed on any property or when any postjudgment paper, other than a wage execution or property execution levied against property of a natural person, is served on a third person, the judgment creditor shall send a copy of the lien, or of the papers so served, together with a statement as to where the lien was filed or on whom the papers were served, to the judgment debtor at his last-known address by first class mail, postage prepaid.