I may be able to help identify the pictures if you haven't been able to yet. Most of the Henke's in Faribault county are around Blue Earth. There are two families which may or may not be related both are from Prussia (Kolberg).
I have a good share of the Henke's that have decended from Erdman Henke b1817. I have living members of the family that may be able to identify the people in the photos.