In order to view old lists, you can adjust how many months back are available in 901 Console, for the Due Date field.
This is done via a setting in the SUPS menu:
Open the System and User Settings console.
Select View Settings,System.
Highlight the option: CORRESPONDENCE_NZTAX.
Locate the menu option for: IR901 Due Date Filter (No. of months back)
Set this to the number of months back as required, for example 24 or 36.
When the 901 Console is next opened, the Due Date drop down list will have been extended back to the appropriate month.
📌Note: the maximum number of months to go back to is 36 months.