Sharingan samples and jutsu notes were not the only valuable things in the Uchiha Clan's secret chamber.
After carefully stowing the red lacquer box in his ninja tool pouch, Shinichi scanned the secret chamber from top to bottom with chakra perception. Earlier, he had been focused on finding items related to the Sharingan, concentrating on the wall niches and scroll racks while overlooking the wall at the deepest end of the chamber, hidden behind a stone monument. The ancient seals remaining on the chamber walls weakened the Byakugan's penetrating vision by more than half. If his flashlight had not happened to sweep over a chiseled crack at the base of the wall, he might have left without noticing it.
The crack was recent. It was not an old scar left behind on the night of the massacre, but one deliberately chiseled open afterward. The stone dust around the marks had not fully oxidized yet, standing in stark contrast to the stone surfaces elsewhere in the chamber, which had accumulated years of dust. Someone had come to this chamber before him—Danzo's people. After the massacre, the Third Hokage had immediately sent ANBU to seal off the Uchiha Clan District and explicitly forbidden Root from entering. But Danzo had never been the kind of man to take a Hokage's orders seriously. He had enough manpower, a sufficient window of time, and every motive to get in first during the first few days after the massacre, when the ANBU blockade was still loose.
Shinichi pried open the loose wall bricks with a kunai, revealing an iron box wrapped in oilcloth deep within the hollow space. The edges of the oilcloth had gone brittle, its fibers crumbling at the slightest touch. The black lacquer on the iron box had been corroded by underground dampness,