"There is still 500 opened items."
Police needed to make inquiries with the senders of those items and the intended recipients to ascertain what items "may or may not have been taken".
Judge Ryan granted the extension to January 30 and remanded Lindsay on bail to February 14 for a post-committal conference.
Lindsay, who had been contracted by NZ Post, was arrested on November 9 and charged after police allegedly found thousands of items stored in her Frankton home and in a storage unit in Arrowtown.
She had since lost her job and was prohibited from entering any NZ Post store.
Last Sunday, 20 postal workers delivered items of overdue mail to more than 1300 addresses in the Fernhill and Sunshine Bay, Lake Hayes Estate and Arrowtown communities.
If the occupants were not at home, postal workers left a card with NZ Post's contact details to arrange another time for delivery. It is expected to take weeks to complete.
NZ Post said it would use all available resources to locate the intended recipients, including those who no longer lived in the area.