3743 is in the Florida river valley. 3587 was also one of the 8 cars, all the cars are around the La Plata county region, I dont know locals for all of them, they were sold at the Idarado auction in the early 80's. Most of the buyers split crane costs to deposit them at their new sites one after the other.
The Idarado cars differ from normal dismantled boxcars as they were left complete with truss rods, coupler pockets and in a few cases some brake rods still hanging. They also were wired with lights and have some holes and wire coming out of one end.