Yes, you can return your books by dropping them in the black book returns box located in the ground floor lobby of the Spencer Dock Campus Building. The box is to the left as you enter the building, beside the gates where your student card is swiped. This can be done any time during the opening hours of the Spencer Dock building.
You do not need your student card to do this, but you will need your card to get into the college building.
Please Note: When books are returned in this way, library staff collect and return the books for you ourselves. There may be a small delay in the books leaving your library account.