The task force declined to comment on the criticism by the two sides or their negotiations, saying only that it had disclosed the information of the new claim to Mr. Gurlitt’s lawyers. The documents backing the third claim—including the claimant’s identity—were released to Mr. Gurlitt’s team but not to the Rosenberg heirs, both parties said. Neither the task force nor Mr. Gurlitt’s representatives would disclose any information on the new claim.
“Mr. Gurlitt’s lawyers have a right to be informed about every claim that has been filed against him,” said Matthias Henkel, the task force’s spokesman.