If the bottom is nailed on it is unlikely to be a cartridge box of any kind. Nails would work loose under the weight of the ammo. The ones I have seen are almost always made with dovetails, or finger joints for the more inexpensive cases.

W Richards Liverpool was a fine maker. Not to be confused with the multitude of continental junkers utilizing the Richards name to capitalize on Westley Richards’ reputation. William Richards was the real deal.