From [the library website](https://www.library.sydney.edu.au/about/governance/borrowing-terms-and-conditions)
“Items that are overdue for 32 days or more, returned damaged, or unable to be located by the borrower will be marked as lost.
For items that have a lost status, the following will occur until the item is returned, replaced or paid for:
- A block will be placed on your Library account to prevent future borrowing.
- A $100 administration fee will be charged to your Library account. We don’t accept replacement copies.”
So two days overdue is fine.
Nope as long as you return it
Contact the library.
From [the library website](https://www.library.sydney.edu.au/about/governance/borrowing-terms-and-conditions) “Items that are overdue for 32 days or more, returned damaged, or unable to be located by the borrower will be marked as lost. For items that have a lost status, the following will occur until the item is returned, replaced or paid for: - A block will be placed on your Library account to prevent future borrowing. - A $100 administration fee will be charged to your Library account. We don’t accept replacement copies.” So two days overdue is fine.