Under those conditions, I'd would have told the Japanese, sorry about your sushi, but you're going camping.
you're making sense of course!!
Cables decoded from the Japanese in May 1941 said in part,
“We have already established contacts with absolutely reliable Japanese in the San Pedro and San Diego area, who will keep a close watch on all shipments of airplanes and other war materials…”
That same cable also stated that the Japanese had Japanese-American spies in the Army and that they were watching traffic crossing the American / Mexican border.
A January 3rd, 1942 army MID memo states, “‘there can be no doubt that’ most of the leaders within the Japanese espionage network of Japanese clubs, business groups, and labor organizations “continue to function as key operatives for the Japanese government along the West Coast”.
So we knew that the Japanese had a spy network in America before Pearl Harbor and we believed it was still operating after the attacks.