Furthermore, on the outside of Koguchiita (the cut end of a board), two pieces were found on the north side and one piece on the south side, which made the number of bronze mirrors detected 23 pieces in total.
また、木口板（こぐちいた）の外部にも北方で2面、南方で1面置かれていて、計23面の銅鏡が検出されている。