Some of the facts I have are:
Some Sears documents include railroad names: Texas & Pacific Railway Company, Santa Fe Railroad, St. Louis Southwestern Railway Co. of Texas, and the Baltimore & Ohio Railroad Co.

By the 1930s, the Modern Homes department had shipped major lumber and millwork from plants in Mansfield, La., Newark, N.J., Norwood, Ohio, and Cairo, Ill. So all shipments of lumber would have fanned out throughout the United States from those three locations.

Sears sold over 100,000 Kits between 1908 and 1940. Sears has very little archived infomation on these houses.