This document consists of official correspondence from July to December 2002 between Sergei Adamovich Kovalev, a State Duma Deputy and head of an independent commission, and Russian security agencies (FSB and MVD) regarding the 1999 apartment bombings. The letters address inquiries into Criminal Case No. 103, specifically the explosions on Guryanova Street (September 9, 1999) and Kashirskoye Highway (September 13, 1999). The MVD clarifies that while standard procedures only required keeping emergency call recordings for six months, a specific phone warning from September 13, 1999, was preserved and transferred to the FSB investigation. The FSB initially refused to provide investigation details citing Article 161 of the Criminal Procedure Code, but later declassified information concerning the testimony of suspect Adam Dekkushev following his detention in July 2002. The correspondence highlights the procedural hurdles faced by the Kovalev commission in accessing investigation data from the Prosecutor General's Office and the FSB.