 These manuscripts were held at the Polish Museum in Rapperswil, Switzerland, until World War I and at the National Museum in Warsaw where it was lost during World War II.In letters to professor Michał Wiszniewski and Simonas Daukantas, Nezabitauskis claimed authorship of an unfinished manuscript of a Lithuanian–Polish dictionary and of a 75-page booklet on beekeeping translated from a Polish work by Jan Krzysztof Kluk.While this claim has been rebuked by literary historians who showed that the works were written by his half-brother Kiprijonas Nezabitauskis, it is still sometimes repeated.