(1) If the injured worker or beneficiary elects to seek damages from the third person, notice of the election must be given to the department or self-insurer. The notice shall be by registered mail, certified mail, or personal service. If an action is filed by the injured worker or beneficiary, a copy of the complaint must be sent by registered mail to the department or self-insurer.

(2) A return showing service of the notice on the department or self-insurer shall be filed with the court but shall not be part of the record except as necessary to give notice to the defendant of the lien imposed by RCW 51.24.060(2).