By Leila Miller

Item 1 of 5 Paul Post, a retired Dutch systems specialist, looks at the war-time diaries of his father, who described working in the Netherlands’ diamond bureau during the Nazi occupation, in Driehuis, Netherlands October 6, 2025. REUTERS/Piroschka van de Wouw

[1/5] Paul Post, a retired Dutch systems specialist, looks at the war-time diaries of his father, who described working in the Netherlands’ diamond bureau during the Nazi occupation, in Driehuis, Netherlands October 6, 2025. REUTERS/Piroschka van de Wouw Purchase Licensing Rights , opens new tab

MAR DEL PLATA, Argentina, Oct 11 (Reuters) – Dutch systems specialist Paul Post had glimpsed the notebooks that contained his father’s Nazi-era diaries before, but when he rediscovered them in an attic 15 years ago, the recent retiree finally had time to closely examine them.

Post, 74, had no idea that they would ultimately lead to Argentina, where in September the daughter of a high-ranking Nazi official was chargedwith concealing an 18th-century painting looted during the Holocaust.

In his diaries, Post’s father described working in the Netherlands’ diamond bureau when it was taken over by the Nazis. As Post began researching the events, one name jumped out: the Nazi official Friedrich Kadgien.

Kadgien oversaw the Nazi looting of diamonds and gold from occupied countries. Post began to follow Kadgien’s wanderings after the war, hoping to solve the mystery of the diamonds that historians say are still missing. He learned by chance that Kadgien was believed to have also possessed looted art.

The hunt led him and Dutch journalists to the peaceful residential neighborhood home of Patricia Kadgien, 60, in the seaside town of Mar del Plata in Buenos Aires province, where “Portrait of a Lady” had been hanging prominently in her living room. The reporters spotted it in a real estate listing in August.

Her attorney, Carlos Murias, told Reuters that she did not know about claims the painting had been looted from the collection of Jewish art dealer Jacques Goudstikker and she has denied having hidden it.

Nazi-related discoveries like this occasionally pop up in Argentina, which after the war received both Holocaust survivors and dozens of Nazi war criminals, including Adolf Eichmann and Josef Mengele. In February, President Javier Milei met with representatives of the Simon Wiesenthal Center, who asked for help accessing materials to investigate Nazi banking activities in Argentina. And last May, the Supreme Court announced it had found thousands of Nazi labor organization membership booklets in its basement archive.

Post’s unlikely role in the painting’s discovery underscores the complexities of finding Nazi-looted art today. An estimated 600,000 pieces were stolen from Jewish families, and more than 100,000 have never been returned.

“I’m just an amateur, I’m not a historian, nothing at all,” said Post. “I knew I was right on Kadgien.”

Read More