Before their escape from the camps on 4 May 1945, the SS tried to destroy the evidence, allowing only approximately 40,000 victims to be identified. During the first days after the liberation, the camp's main chancellery was seized by the members of a Polish inmate resistance organization; they secured it against the wishes of other inmates who wanted to burn it. After the war, the archives of the main chancellery was brought by one of the survivors to Poland, then passed to the Auschwitz-Birkenau Museum in Oświęcim. Parts of the death register of Gusen I camp were secured by the Polish inmates, who took it to Australia after the war. In 1969 the files were given to the International Red Cross International Tracing Service.