Diaries kept by Hans Freiherr von Berlepsch during his expedition to eastern Paraguay in 1886 have been lost

I have had disappointing news from the Berlepsch estate in Thuringia in eastern Germany - see item below on 4th January 2007. I was hoping that they might still have diaries kept by Hans Freiherr von Berlepsch during his expedition to eastern Paraguay in 1886, which would indicate the exact location where he had seen the blue macaws, which I suspect might have been Glaucous Macaws (Anodorhynchus glaucus). Unfortunately if he had diaries, they have been long lost.