Here is a good source mentioning the Macedonians as fugitives in Austria 1765. This could be earlier because the source only tells when the Austrian Empire extends its boundries towards Transylvania, this is done in 1765 and 1766!

The quote is taken from this book “Austria: Vienna, Prague, Hungary, Bohemia, and the Danube; Galicia, Styria, Moravia, Bukovina, and the Military Frontier.” by J. G. Kohl, 1844, page 269.