I am also searching for the Förster/Foerster family from Silesia. My ancestors immigrated from the Seitendorff, Silesia area in 1882. I do not know the Kreis and have been told there are 4 Seitendorff's. I do know that at least one Seitendorf is very near the Austrian border. Let me know if you would be interested in additional information. I have nothing beyond the immigrant though.