Thanks for your interest. I've been working on a local project to create a family research resource from local German language newspapers published in Milwaukee since 2007. The core of the index is made up of the death notices and obituaries, but also biographical and related articles that would likely only be found in these papers. Currently, there are about 315,500 entries in two volumes totaling about 5500 pages.
I've sent you an Excel file with entries for the Cotzhausen family. There are examples in local German papers of Fr. von Cotzhausen acting as agent for German Consulate offices to locate heirs, etc. I haven't indexed these items.
Gary Rebholz, compiler/editor
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).