Argentina's Supreme Court has found dozens of boxes filled with Nazi material among its archives in its basement.

The 83 boxes hold documents including postcards, photographs and notebooks, as well as propaganda material, the court said on Sunday.

Court employees discovered the material by chance while preparing for the creation of a museum.

"Upon opening one of the boxes, we identified material intended to consolidate and propagate Adolf Hitler's ideology in Argentina during the Second World War," the court said.

The court has invited Argentina's Holocaust Museum to help document and preserve the materials.

Experts will also examine them for any clues that can "shed light on still-unknown aspects" of the Holocaust, such as international financing networks used by the Nazis, the court said.

Where did the Nazi boxes come from?

The boxes were sent by the German embassy in Japan to Argentina during World War II aboard a Japanese steamship, according to the history that the court was able to piece together.

Germany's diplomatic mission in Argentina had claimed the boxes contained "personal effects"

But customs authorities at the time randomly searched several boxes and found the Nazi material.

Concerned that the quantity and nature of the material could affect Argentina's neutrality during the war, officials confiscated the 1941 shipment, the court said.

The case was then referred to the Supreme Court. It isn't sure what action the court took at the time.

Argentina provides more access to historical documents

The basement find comes as Argentina's national archive has digitized over 1,850 original documents on National Socialism for free public access.

"The historical value of this material is enormous," Argentinian author and researcher Julio Mutti told DW. For years, Mutti has studied connections between Argentina and the Nazis.

"These are extensive files," he said, adding the documents contain information about Josef Mengele, the notorious SS doctor at Auschwitz who is known for his cruel human experiments, and Adolf Eichmann, a central planner of the Holocaust. Both went into hiding in Argentina after the war.

Ariel Gelblung, director for Latin America at the Simon Wiesenthal Center, a Jewish human rights organization documenting and researching Nazi crimes and the Holocaust, said the Argentinian government recently provided the center with a trove of documents that could provide clues on how Nazi fugitives financed their escape.

"We are specifically researching the financing of the flight of Nazis to Argentina," he told DW.

"We are following a trail that no one has investigated before," Gelblung added. "We are analyzing suspicious financial transactions that were disguised as diplomatic missions or accounting entries in the central bank archives."

Crucial clues were apparently not to be found in the usual archives, and the Wiesenthal Center had requested more access.

"Many of the documents were in areas of the state that had not previously been considered in connection with the Nazi escapes," said Gelblung.

What was Argentina's role during World War II?

Although Argentina remained neutral for much of World War II, the European Holocaust Research Infrastructure site notes that a "significant portion of Argentina's population was of German origin" and that "Nazi propaganda was highly influential."

Just months before the war ended, however, Argentina declared war against Japan and its ally, Germany.

Fleeing Nazi persecution in Europe, some 24,000 Jews entered Argentina between 1933 and 1943, according to the Holocaust Encyclopedia.

Another 20,000 Jews entered the country illegally. 

Argentina's President Juan Peron, who came to power in 1946, was a prominent Nazi sympathizer and the country became a haven for Nazi Germany's war criminals after the end of World War II.

Edited by: Zac Crellin and Wesley Dockery