A Brazilian national library is asking for the return of around 6,000 books that have not been returned since they were borrowed. The Biblioteca Nacional de Brasília launched a search for these books on September 23, giving borrowers a one-month amnesty period during which they can return the books without facing any penalties. The library has expressed understanding about the situation, noting that the books "had promised to return" but have not been heard from since. It has emphasized that no explanation is needed—only the return of the books. The library's collection includes about 60,000 books, of which approximately 6,000 are currently unreturned. The missing books cover a wide range of genres, including manga, comics, books for young readers, and works of fiction. According to the Secretaria de Cultura e Economia Criativa of the federal district, 6,432 books with overdue returns are linked to 4,151 users who still owe the library. This count includes books that are at least one day past their due date but excludes those whose due dates have not yet arrived. Some of the overdue books were borrowed as early as July 9, 2013, and have remained missing for more than ten years. However, the library has decided not to aggressively pursue these overdue books, instead offering a "grace period" with no penalties. Borrowers can return the books directly at the library's counter from Monday to Friday between 8 a.m. and 10 p.m., and on Saturdays and Sundays between 8 a.m. and 2 p.m. According to the library's guidelines, registered users can borrow up to five books at a time, with a maximum borrowing period of thirty days. Borrowers can renew their books online twice, as long as the initial due date has not been exceeded. A similar campaign in 2024 led to the return of 4,664 books, according to the Biblioteca Digital de la BNB. That campaign aimed to recover books that had been missing for several years and to make these resources available to the public again. The library has now repeated this approach, highlighting that a book borrowed by one reader is temporarily unavailable to others.