It's been three months since the Kunstmuseum Bern said it would accept a bequest of 1,600 works from the late Cornelius Gurlitt, son of a Nazi-era art dealer. But the gift of works by the likes of Monet, Manet, Gauguin, Renoir, Rodin, Matisse and Pissarro might not journey to its new home anytime soon, according to officials at the Swiss museum.

A cousin of Gurlitt's filed a petition in a Munich court last fall to prevent the transfer of artworks. Uta Werner is challenging her cousin's will and the legal action is tying up the artworks indefinitely.

Kunstmuseum trustees said Tuesday that they regret the delay caused by the legal action. They cited the settlement of restitution cases as impacted. Three works so far have been identified as looted from Jewish families. And while the museum has vowed to return contested works, the Gurlitt trove is not yet in its possession.