May I assume your final paragraph refers to the report captured by the German surface raider Atlantis before Automedon was sunk? If so, then the second ‘shot heard ‘round the world’ would surely be the Atlantis shot that went through Automedon’s radio room and killed the marine guard charged with throwing the weighted bag containing the report over the side...
These papers told the Japanese that the British Far East Fleet would be no threat at all to their moves south; the British were stretched too thin to support such an effort.
Additionally, in Professor Chapman's The Price of Admiralty, the Japanese concerns, as a result of having these papers, were concentrated on the US naval forces - those especially at Pearl Harbor.
This capture of documents is only made known after WWII had ended - the Canadians in particular were not happy.
Finally, the German Naval Attache in Tokyo got a very rare Japanese sword for his assistance in the matter.