7 December 1941
Re your #910.*
Your instructions and your #911** have been duly received and decoded, and as soon as we have composed and dispatched this telegram we will commence the demolition and destruction by fire.
Also we have destroyed the codes brought by Kosaka. (The HA code, O code, NE code, and the YO code).
Furthermore, the key of your #881***, first part, and your Circular #2400****, should have been burned but because the mails to Mexico are not safe it has not yet been sent.
Please be advised of the above.
JD-1: 7299 (H) Navy Trans. 12-10-41 (S-TT)
*JD-1: 7147 S.I.S. 25854. Directs destruction of remaining cipher machine and machine codes.
**JD-1: 7101 S.I.S. 25754. Instructions for disposing of codes.
***JD-1: 7076 S.I.S. 25753. Re new keying method for cipher machine.
(EXHIBITS OF JOINT COMMITTEE , EXHIBIT NO. 1 INTERCEPTED DIPLOMATIC MESSAGES SENT BY THE JAPANESE GOVERNMENT BETWEEN JULY l AND DECEMBER 8, 1941)