Meiji Restoration Mystery Tour: Decipher Chapter Meitantei Conan : Season 17 Episode 29

Conan investigates further and learns where the treasure is. As they reach the spot where the treasure is hidden, Conan puts Kogoro to sleep and reveals the truth behind all the suspicions. He reveals the treasure was the will to change a country, not buy it. Afterwards, Conan revealed there was a stamp on the letter that revealed the treasure worth millions and was supposed to be used to change the country, but was ripped up in the culprit's rage.