in 1939 the Gerrer Rebbe had an esrog sent thru Trieste to his self the war broke out on September 1 1939 [Friday before the first selichos] the rebbe was in Warsaw had an esrog.the Brisker rov had a lulav i believe from the previous year somehow haddasim and aravos were also found . on the first day of succos people stood for hours in a very long line to make a blessing[no shaking] the story is printed in 1 of the generic artscroll holocaust books [maybe the unconquerable spirit]