The proceedings were scheduled to begin in October 29 but has not been put off until May next year at the request of the statutory managers following the discovery of the document boxes.
In its reply to investors today, Grant Thornton said the group had failed to understand the situation with Aorangi Securities, despite many meetings with them.
The managers said Alan Hubbard transferred the $60 million of assets to Aorangi in 2009 and 2010 but failed to complete the change of ownership.
"It's like selling your car, but not completing the change of ownership papers properly. Someone else now owns your car, even though it is still registered in your name. As a result, it is the view of the statutory managers that Aorangi Securities has beneficial ownership of the $60 million, even though the assets are in the names of the Hubbards," Grant Thornton said.
"Since the statutory managers commenced proceedings to confirm the ownership, Mrs Hubbard has changed her mind and is now personally contesting Aorangi's ownership of the $60 million of assets. She wants to keep the assets worth $60 million. It is this action that is causing the significant delay, including having to find every relevant document on record.
Grant Thornton acknowledged that the discovery of the 70 boxes had caused "further delays" and this was disappointing for investors.
"However, this additional information is now essential given Mrs Hubbard is contesting the ownership of Aorangi assets," the managers said.