I do not know, which Polish sources are referred to in your materials, but I have several books, majority unfortunately in Polish, (by Kopanski, Morgala, Goworek, etc.) which indicate just one Camel in Poland (not counting the fuselage, now in Polish Aviation Museum in Cracow, which came to Poland much, much later). This is the current historical version, supported by many historians. And there is indeed no trace of further Camels in numerous photos of Kosciuszko Squadron aircraft from 1919-1921 period.
And Rajski crash in Lwow in 1921 involved the F5234, which beforehand was bought from Murray (it was his private mount).