Is this the image you were thinking of? This version is from the Library of Congress. You'll notice a second type of square carriaged coehorn on the right of the image in the "ghost" area. Its important to note that these coehorns are not the open "Box type" of carriage constructed of thick planking, but rather are squared solid lumber.
The box in front of the coehorn clearly says "Richmond Arsenal" in the large block letters on the right of the panel facing the camera. It also has a date (186 3something) in the center of some lettering that is set with a radius on the left side of the panel facing the camera.
And this image of the same location from a different angle.
Chris Hubbard
146th New York Volunteer Infantry (ACWSA)
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