Hermann Junker (1877-1962) was a German archaeologist who worked at Giza before and after the first World War, and excavated from 1928-1939 an extensive neolithic site in the West Delta.
Documents DIST.52.05 and DIST.52.06 list Juncker but that may have just been a substitution which meant the Kunsthistorisches Museum in Vienna, rather than meaning the objects were intended for a personal collection.
Links
[1] https://egyptartefacts.griffith.ox.ac.uk/destination-country/austria