On 11 December two staff officers, IJN Commander Yuji Yamamoto and IJA Major Takahiko Hayashi, returned to Tokyo from Rabaul and confirmed Hattori's, Tsuji's, and Sejima's reports.
Pada 11 Desember 1942, dua perwira staf, Letkol Laut Yuji Yamamoto dan Mayor (AD) Takahiko Hayashi tiba kembali di Tokyo dari Rabaul, dan menegaskan laporan-laporan yang dibuat Hattori, Tsuji, dan Sejima.