According to the query of personal library network, regarding the filling of file boxes and the compilation of file numbers, the cover file number consists of fonds number, catalog number and file number, and fonds number: the number assigned by archives to filing units. Directory number: the directory number to which the files in the whole family belong. Duplicate file directory numbers are not allowed in the same tribe. Case number: the serial number of the case file in the directory. Duplicate case numbers are not allowed in the same case file directory. It can be seen that the directory number of each cooperation document is different, so there should be five document numbers in five boxes.