"I’ve been researching the location of Schneebergs that were once Prussian (most of Bohemia is now in Austria) but have found nothing conclusive yet."
in present Austria there is not anything of Bohemia (Böhmen)!!! in fact Bohemia was for nearly 400 years a crownland of the austrian-Hungarian Empire and is now the czech Republic!
and Schneeberg, like stated in the posts before is now named
Sněžník in czech language and its located at the Hoher Schneeberg now named Děčínský Sněžník.
old map of Austrian-Hungarian Empire > 1 Bohemia:
http://www.brainworker.ch/Oesterreich/Austria-hungary.pnghistory of Bohemia:
http://en.wikipedia.org/wiki/Bohemia