Here's a nice plastic box.
The shape is a rather innovative style, though not all that practical as it will not stack or stand well. But it looks neat! It's anyone's guess as to what could of been inside. T-shirts to food or even neck-ties. It's obviously pretty old, with the "Segasonic" word and old-school chubby cross-eyed Sonic. He looks like he might be getting ready to fight something. There's a sunburst in the corner, but it's all in Japanese so it doesn't really offer a hint.