Library items are marked as lost shortly after they become overdue.  Once the item is lost, you are responsible for paying the replacement cost.

Check your Library Account to view the status of your current loans, and to see details of any fees that are owed.

If you still have the item that is associated with the fee, please return it promptly.  Once the item has been returned, you will no longer owe the replacement cost. If the library item is not returned, you are responsible for paying the replacement cost.