Insulated Building Systems Limited (in liquidation) Address of Registered Office: Care of the Official Assignee, Auckland. Last Day for Receiving Proofs of Debt: 22 September 1999. For Inquiries Contact: Christine Roberts. Telephone: (09) 357 4179. OFFICIAL ASSIGNEE. New Zealand Insolvency and Trustee Service, Private Bag 92-513, Wellesley Street, Auckland. Telephone: (09) 357 4141. Facsimile: (09) 357 1776.