Among the American papers, I found some film advertisements and brief mentions in the Lock Haven Express and the Williamsport Grit (both from Pennslyvania). The Grit was a weekly newspaper, with both a local and national edition. On July 1, 1928 the national edition of the Grit carried a small, captioned photo of Louise Brooks on the front page. The item was titled "Star Gets Divorce." Paper of Record also had a long run of the Afro American. This newspapers was the leading news provider for African-Americans in the Baltimore / Washington, DC Metropolitan area as well as being the longest running African-American, family-owned newspaper in the nation. My search under "Louise Brooks" turned up little, which is not surprising. However, I did find a brief write-up regarding Beggars of Life (1928). The paper noted the important role Edgar "Blue" Washington (and African-American actor) had in the film.
Citations have been added to the respective bibliographies.