Here is the builders photo of caboose 05. This is scanned from a print purchased from Frank Ellington some years ago. As I recall, he obtained access to the ACF builder's photos and photographed the ACF file prints on 35mm film. He had lists of Santa Fe cars built by ACF and non-Santa Fe cars.
Notice the Sams coupler. The box cars and gondolas also came with Sams.
I have no idea as to the color of the "Gold Belt" herald. At least a couple of box cars that came to California through the N-C-O weathered to show the herald. But I don't know what color showed.
Below is a builder's photo of one of the box cars; also from Frank Ellington. Looks like the herald is not white (maybe yellow?). But no idea if this is the usual or a one-off paint job.
Brian Norden