"The family Berolzheimer was in no way given access to the proceeds," Stuttgart's state gallery said.
One of the gallery's researchers had been able to trace back the artworks' origins, which unequivocally proved they had been "seized as a result of Nazi persecution."
One of the drawings by Schuez is a preliminary sketch of his painting "Sermon listeners outside the church," which is also owned by the museum.
The state gallery's director, Christiane Lange, said the museum hoped to repurchase this drawing, so that the two works can continue to be researched and presented together.
The other drawing is Hoogstraten's undated "Man with a torch."
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