Book drops on campus are open 24/7. There is a book drop located outside the south entrance of the Melville Library and outside the doors to the Health Sciences Library.
You can also return books to a SUNY library.
You can mail to the address below.
Stony Brook University Libraries Frank Melville Jr. Memorial Library Attn: Circulation Accounts 100 Nicolls Road, S-3410 Stony Brook, NY 11794-3339