(a) The sheriff shall serve the writ of seizure, together with a copy of the complaint and motion for ex parte issuance of the writ if the writ has been issued ex parte, upon the defendant and any person not a party who is found in possession of the property, in the manner provided by Rule 402(a) for service of original process and shall take possession of the property.(b) When a person in possession of the property who is not a party to the action is served with a writ of seizure, the sheriff shall notify the person that he or she has been added as a defendant and is required to defend the action and shall so state in the return and the person shall thereupon become a defendant in the action. Copies of all prior pleadings and motions not previously furnished to the person shall be forthwith served upon him or her by the plaintiff in the manner provided by Rule 440.