This collection of documents details investigative efforts by Sergei Kovalev and his commission regarding the 1999 apartment bombings and the Ryazan incident. A key piece is a 2002 letter from Chief Military Prosecutor A.N. Savenkov denying that Private Alexei Pinyaev, a frequently cited witness in the Ryazan case, served in the 137th Ryazan Regiment during 1999 or was ever under criminal investigation. Kovalev's own notes and requests show he was investigating whether specific phone prefixes (starting with 224) were exclusive to the FSB in 1999. He also sought official victim lists from the Guryanova Street and Kashirskoye Highway bombings from the Moscow prefect. The documents list various names of investigators and witnesses potentially relevant to the suppression of the Ryazan 'training exercise' story.