There are doubts, however, whether the swords known to have been at Żółkiew in 1738 and at Nieśwież two years later, were in fact the same sword. The Radziwiłłs' castle was plundered by the Russian army in 1812 and the subsequent fate of their replica of Szczerbiec is unknown. This fact cast doubts over the authenticity of Szczerbiec held in the Hermitage. Some experts suspected that the sword possessed by the Russian imperial museum was in fact the Nieśwież replica, not part of the original royal insignia.