C'mon Dan...Just admit that you were mistaken about the two bright spots being the butt plate screws of a carcano ....
You posted the picture of the butt of a carcano .... It should be obvious that the bright spots in the photo are not the screws in the butt plate of a carcano.
Well, whatever they are Walt, they reflect light in exactly the same way.
The light reflecting on the spots of the rifle butt by Fritz's feet are exactly the same as the spots reflecting on the butt plate when Day lifts the rifle up.
The reflective spots demonstrate demonstrate the rifle was in an upright position when Fritz entered the area where the rifle was concealed.
That's all there is to it.