The Fundação Biblioteca Nacional (FBN) in Rio de Janeiro has received the return of 164 historical publications that were taken by the Brazilian Federal Police six years ago. These items were returned on September 17, 2026, after a court decision by the 4th Federal Criminal Court in Rio de Janeiro. The collection includes 162 issues of O Guri, an Almanak Laemmert from 1848, and an Almanaque dos Heróis Comandado por Superman from 1949. The FBN confirmed the return of these items after a detailed provenance analysis, which involved checking stamps, heritage records, labels, and other historical classification methods used by the library. The 164 items were part of a larger seizure of 217 items conducted on February 12, 2020, as part of Operation Dom Pedro II, which aimed to recover cultural and historical heritage. The FBN had been examining these items to determine their origin, and the 164 items were identified as belonging to the institution's collections. The other 53 items in the seized batch have not been accounted for, and neither the Federal Police nor the FBN have provided details on what happened to them before the seizure. The return of these items was different from a previous restitution of 48 other stolen publications in June 2026, which included issues of O Tico-Tico from 1908, an issue of O Nacional from 1873, and two issues of Romântica from 1969. The FBN attributed the 162 copies of O Guri to its collections based on historical classification methods, while the Almanak Laemmert and Almanaque dos Heróis Comandado por Superman were identified through registration numbers and stamps. The return of these items marks a significant step in the FBN's efforts to recover lost cultural heritage. The process of verifying the provenance of each item highlights the importance of meticulous record-keeping in preserving historical collections. While the return of these materials is a positive development, the disappearance of the remaining 53 items remains a mystery, underscoring the ongoing challenges faced by institutions in protecting and recovering their cultural assets.