No, I have a personnel file of Dmitriy's brother-in-laws, too. This file ends in 1908 and it seems, that this file was not closed.
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I have the same situation with my great grandfather. The possible reason is that he was working in Siberia at the Department of Railroads and his personal file was stored in St. Petersburg, so docs starting from 1915 were not sent from Siberia to St. Petersburg and later in 1919 they were gone due to Civil war.
Maybe you can send it (a personnel file of Dmitriy's brother-in-laws) to me and will take a look?
About Nikolay Evald (Ivan) von Hunnius. (link: http://regiment.ru/bio/G/80.htm). See here: rosgenea.ru/?alf=4&serchcatal=%C3%F3%ED%ED%E8%F3%F1&r=4. He dies in 1957 in Germany, he was serving in White army during Russian Civil war. Source is the Volkov's book Officers of Army Cavalry. It also states that Nikolay serves in Zaamurskiy kray (Siberia). So that could be the reason why his personal file is ended by 1908. He might be send at that time to a new place in Siberia. I am not able to recognize the lastly mentioned name of troops where he was a commander in his personal file.
He is in the Calendar of Kovenskaya gubernia for 1908 and 1909 but not for 1910.
btw.
link - personal file of von Hunnius Karl Robert Emmanuil Fedor. Fedor is the middle name, dated 1900.
About Nikolay Evald (Ivan) von Hunnius. (link: http://regiment.ru/bio/G/80.htm). See here: rosgenea.ru/?alf=4&...1&r=4. He dies in 1957 in Germany, he was serving in White army during Russian Civil war. Source is the Volkov's book Officers of Army Cavalry. It also states that Nikolay serves in Zaamurskiy kray (Siberia). So that could be the reason why his personal file is ended by 1908. He might be send at that time to a new place in Siberia. I am not able to recognize the lastly mentioned name of troops where he was a commander in his personal file.
He is in the Calendar of Kovenskaya gubernia for 1908 and 1909 but not for 1910.
btw.
link - personal file of von Hunnius Karl Robert Emmanuil Fedor. Fedor is the middle name, dated 1900.
But now I have to look for further information in Germany. Well it should be easier to find more information.
At the moment I don't know, how Karl Robert Emmanuil Fedor is related to Nikolaj. But in Germany there are "Deutsches Geschlechterbücher", where the history of the Hunnius familiy is described.
I wrote an email to the city archives in Geesthacht, where Nikolaj died. I hope, he is the right one, because it is possible to find more about his parents and about his own family, too.