Conversely, what happened to the treasures and artifacts of countries like Poland, France, Greece, Yugoslavia, etc. once they surrendered?
For example, I know Britain sent many items overseas to Canada and I heard that the KMT transported many items around rural China in “convoys” to keep them away from the Japanese. I imagine that Germany and Italy kept many of their possessions in underground shelters, the Soviets probably moved a lot of items east like they did with their factories, while conquered countries probably lost many treasures from wartime destruction and plundering.
Poland was a Romanian ally and we (Romania) signed a treaty with them called the Cordon Sanitaire. In 1939, with the war raging on, the Polish leadership and some artifacts & treasures were dispatched through Romania and sent by ship to the United Kingdom.