“When Peter Sachs was only a year old in 1938, the Nazis seized his father’s collection of 12,500 rare posters on the orders of Propaganda Minister Joseph Goebbels. … Today, some 4,000 of the posters, worth at least euro4.5 million ($5.9 million), are in the possession of the German Historical Museum in Berlin, largely in storage. Peter Sachs goes to court Tuesday to try to get them back.”