I used to make these kinds of boxes back when I was learning how to make stained glass windows. They were common small time hobbyist type things. All you need to make them is a few scraps of stained glass, a hardware store glass cutter, a cutting board, straight edge, a measuring tape, some copper foil tape, some solder, flux and a soldering iron or gun, some extra parts such as feet, hinges, chains to keep the top from flopping all the way back, and some patina fluid to antique the finished soldering. Once you have your work table set up you can crank these out all day long for a couple of dollars worth of materials each. They make great projects for teaching new stained glass students basic techniques and they feel a sense of accomplishment since they can make one in the span of a single class. I do not know if this is what you have, but from the photo it very much looks like one of these.