If you're in the market for a coal bunker and have a knack for DIY you can make your own coal bunker at home with some basic materials from the hardware store.
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Lay one of your 4-by-4-foot pieces on a flat surface. Assemble the rest of the box on top of this base.
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Screw the four side pieces onto the base and onto each other.
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Screw two hings to the top of the back of the box.
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Screw the other wing of each hinge onto the sixth piece of wood, which will be the bunker's top.
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Sand the raw edges of the box with sandpaper. Paint the box with a waterproof sealant.