BUENOS AIRES, Argentina — In a hidden room in a house near Argentina’s capital, police believe they have found the biggest collection of Nazi artifacts in the country’s history, including a bust relief of Adolf Hitler and magnifying glasses inside elegant boxes with swastikas.

Some 75 objects were found in a collector’s home in Beccar, a suburb north of Buenos Aires, and authorities say they suspect they are originals that belonged to high-ranking Nazis in Germany during World War II.

“Our first investigations indicate that these are original pieces,” Argentine Security Minister Patricia Bullrich said on Monday, saying that some pieces were accompanied by old photographs. “This is a way to commercialize them, showing that they were used by the horror, by the Fuhrer. There are photos of him with the objects.”

Among the disturbing items were toys Bullrich said would have been used to indoctrinate children, a large statue of the Nazi Eagle above a swastika and a Nazi hourglass.

Police say one of the most-compelling pieces of evidence of the historical importance of the find is a photo negative of Hitler holding a magnifying glass similar to those found in the boxes.

“We have turned to historians and they’ve told us it is the original magnifying glass” that Hitler was using, said Nestor Roncaglia, head of Argentina’s federal police. “We are reaching out to international experts to deepen” the investigation.

The investigation that culminated in the discovery of the collection began when authorities found artworks of illicit origin in a gallery in north Buenos Aires.

Agents with Interpol began following the collector and with a judicial order raided the house on June 8. A large bookshelf caught their attention and behind it agents found a hidden passageway to a room filled with Nazi imagery.

Authorities did not identify the collector who remains free but under investigation by a federal judge.

“There are no precedents for a find like this. Pieces are stolen or are imitations. But this is original and we have to get to the bottom of it,” said Roncaglia.

Police are trying to determine how the artifacts entered Argentina. The main hypothesis among investigators and member of Argentina’s Jewish community is they were brought to Argentina by a high-ranking Nazi or Nazis after World War II, when the South American country became a refuge for fleeing war criminals.

As leading members of Hitler’s Third Reich were put on trial for war crimes, Josef Mengele fled to Argentina and lived in Buenos Aires for a decade.