In the secret chamber, the police found what they said were authentic Nazi artifacts that probably belonged to high-ranking party members during World War II.

Among the items, the police said, were a magnifying glass and photo negatives that appeared to show Hitler holding the same lens. “We have turned to historians, and they’ve told us it is the original magnifying glass” used by Hitler in the photograph, said Nestor Roncaglia, the head of Argentina’s federal police.