(1) Whenever any property of the estate not included in the inventory comes into the possession or knowledge of the personal representative, the personal representative shall either file in the estate proceeding a supplemental inventory within 30 days after the date of receiving possession or knowledge, or include the property in the next accounting.
(2) If the inventory states that no assets of the estate are known to the petitioner and assets of the estate later come into the possession or knowledge of the personal representative, the personal representative shall file in the estate proceeding a supplemental inventory within 30 days after receiving possession or knowledge of the assets.