Family registers have been recently excavated from local josaku (official defense sites) and kanga (government offices) such as Akita-jo Castle, Taga-jo Castle and the remains of the provincial capital of Shimotsuke in the form of urushigami monjo (Lacquer documents); as well as from the provincial capital of Suo in the form of koseki mokkan (narrow, long and thin pieces of wood strung together that were used to write family registers), and are being deciphered with an infrared ray.
また近年、漆紙文書のかたちで秋田城や多賀城、下野国国府跡など地方の城柵や官衙から、戸籍木簡としては周防国国府などで出土しており、赤外線による解読作業がおこなわれている。