"They don't plan to generally borrow more books so it doesn't matter to them that they've got a fine on their card.
"They have basically stolen it."
The highest late fee had accumulated almost $534 and their most overdue book has not been returned since August 2001.
She said the library has a system of three notices when dealing with overdue books.
First, a reminder is sent through email or text three days before the item is due.
Once an item is overdue, they send the first notice, then a second 20 days later.
Two weeks later, a final notice is sent.
Library staff follow up this notice by trying to get in contact with the person.
Overdue fines go up 20 cents a day and have a cap of five dollars per item for the six days that the library is open every week.
Days that the library is not open are not counted in overdue time.
Mrs Green said she would rather find ways to help see debts paid if a fine is building.
"Sometimes, it's a case that people recognise they have got a charge on their card and they find that difficult to deal with, so they don't come back to the library."
They were open at any time to people coming in and talking to them about debts, she said.
"We can put systems in place, negotiate the fines, give them a fresh start.
"We don't want people to think: 'I can't go near the library'," she said.
"We don't want it to be a negative experience."
