The boxes were in the book collection of Waclaw Jozef Zawadzki, a member of the Polish Bibliophile Society. How they ended up in this book collection is not known to us.
Cited from Wikipedia:
PPS activist, imprisoned at the Citadel before World War I for his activities in the PPS, volunteer in the Polish-Bolshevik war in 1920. Between the wars he studied history and ran a mail-order antique shop.
During World War II he was in the Warsaw Ghetto. There he organized secret teachings and the distribution of underground press. In 1942 his wife was killed in the ghetto, he himself, along with his daughter, secretly left the ghetto in January 1943. After the end of the war he did not return to his family name, remaining with the one resulting from documents used during the occupation.
From 1945 to 1948 he was director of the "Wiedza" Publishing Cooperative. He belonged to the PPS (expelled in 1948), and in 1956-1967 to the PZPR. He was expelled from the party for signing a letter in defense of Leszek Kołakowski. From 1955 he worked at the State Publishing Institute, where he was primarily involved in editing memoirs, including in the Library of Polish and Foreign Memoirs series. He was also a translator. In the 1970s, he became involved in opposition activities. He was a signatory of Letter 59 against constitutional changes and was a member of the KOR (from October 30, 1976) and the KSS KOR. He was a member of the Polish PEN Club and the Union of Polish Writers.
He was buried at the Powązki Cemetery in Warsaw.