They were recovered during a refurbishment in an unoccupied apartment.
According to a team of conservators, who carried out an initial inspection of the find in consultation with the director of the Warsaw Rising Museum, the discovery is of immense historical merit.
It contains valuable documents of the High Command of the Home Army, the anti-German resistance movement, blank German documents, maps, copies of Polish-language newspapers published in England, as well as personal items such as photographs and identity cards.
The discovery also includes a war-time diary written by a young woman, whose identity remains unknown.
Museum experts are now to conduct the provenance research of the documents and undertake their conservation.
Warsaw Mayor Rafał Trzaskowski has described the discovery on social media as sensational.
(mk/tf)
Source: PAP