Okay. Well, I can't help you with the house property that is shown on the map in Post # 17, but I can tell you two locations the Sorden brothers owned. Lets start with the one by the Pic-A-Lilli.
The below maps shows the exact location of a small tract of land the Sorden Brothers owned sometime around 1890 or slightly after. I know this because elsewhere on the map Rider/Wilkinson is shown and they acquired their property around 1890. The map does not have a date on it.
I have arrows pointing to known property corners which clearly shows I have the correct location. And I have yellow lines around the Sorden land. Compare the two maps closely.
The exact location today is shown where the pointer at the below link is pointing to.
http://maps.njpinebarrens.com/#lat=39.75445911464937&lng=-74.72212571304323&z=16&type=hybrid&gpx=
It is interesting to note that this property was still owned by the Sorden family as late as 1987 when Miriam E. Sorden died. The executor of Miriam E. Sorden will who may have been a family member sold the property to Harry and Reet Robinson of Winfield Illinois for $7,100 in 1991. I have found no record of the property being sold again but I have been told that the Whalen family owns all of the bogs now. They may or may not own this particular tract of land.
When I get a minute I will post the other location. That location actually mentions John Sorden which is the name I believe you mentioned. Hopefully, I am going back far enough in time that I am actually helping you with what you want to know.
Guy