"First, We tried to locate the depository that stores the artifacts gifted to the curia. It sounds the most direct and simplest way, however, it was not. In the late 1500s, there was no designated storage for the offerings and other valuable articles belong to Popes or the Vatican. Additionally, the inventories of those storages are unorganized or missing because the palace was relocated to multiple locations in Rome, and often expanded between the late 16th century and mid 17th century. Lastly, it is almost impossible just to walk in those storages one after another and search for an object in such highly sacred places as the Vatican.  For example, in such storages deep in the Vatican, there are religious relics like a martyred saint's head or a wooden fragment of the cross on which Jesus was crucified. It is not a place where a profane person enters with shoes on. ---Thus, It is necessary to review the inventories of the depositories dated after Gregory XIII at archives by our own eyes so that we can confirm"the Screens are not in the repository", or if we found a record of the screens at any historical point, it gives us the reason to physically investigate the storage. "

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"On the record, it says the repositories are consist of numerous rooms and enormous spaces. Each item in the inventories is numbered, so the number (of the screens) gives us the first step to the actual screens. Documentary confirmation that the folding screen existed and its inventory number is the indispensable processes of discovering the folding screens. In the case of Vatican depositories, their inventory records are not in the Vatican, but in Archivivo dello Stato di Roma(ASR) . 

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[Midori Wakakuwa, Kiyono Shimbo, Paola Cavaliere: Azuchi city screens research project report, p2-3, February 15, 2007]