The Bryant and May ones they used to sell in Britain, which spawned the term "matchbox cars" for toy cars that fit inside, were/are a rectangular cuboid box. So 8 corners. Unless it's a trick question involving removing the match tray from the box first.
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The mathematical name for corner is 'vertex' A cuboid has 8 vertices or corners. An example of a cuboid is a cereal box or a dice.
8 corners
It has 4 corners
An octahedron has 18 corners.
8 corners