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.
Den 11. december vendte to stabsofficerer, kommandørkaptajn Yuji Yamamoto og major Takahiko Hayashi, tilbage til Tokyo fra Rabaul og bekræftede Hattoris, Tsujis og Sejimas rapporter.