There are a few boxfish species that stay small like that, fish base has 3 or 4 listed. I don't think I've ever seen them in the trade, most of them are sub-tropical or temperate and wouldn't do well in a reef style aquarium. They are more laterally compressed than o. cubicus, kind of like an armored toby.
If you find a small tropical boxfish let me know, I'd love to have one too.
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