Answer:
The Lincoln Park John T. Richardson Library 24-hour book drop is located outside the west, quad-side library entrance to Kelly Hall behind the statue of Louise de Marillac. See map and photo below.
The downtown Loop Library book drop is located in the wall to the right of the library entrance on the 10th Floor of DePaul Center. NOTE: Access to this book drop is subject to the DePaul Center building hours.
Do not return loanable technology (e.g., cameras, turntables, etc.), media (e.g. DVDs, LPs, etc.), video games, video game consoles, or productivity tools (e.g. cables, chargers, headphones, etc.) in the book drops. Please return those items in person to the library from which you borrowed them.
Lincoln Park, John T. Richardson Library 24-hour book drop map location:

