Does anyone have a transmittable copy of the thesis "Logical and cohomological aspects of the space of points of a topos" by Carsten Butz? The link provided in http://ncatlab.org/nlab/show/point+of+a+topos seems to be dead, and I can't seem to find a copy elsewhere.
Apparently he used to have some affiliation with http://www.itu.dk/. You might try contacting them.
You could also try contacting the author of the article you mention: http://ncatlab.org/nlab/show/Urs+Schreiber.
Hopefully one of these pans out for you.