noun
outer box; outer case; slipcase
Refers to the outermost container of a product, such as a cardboard box, slipcase, or protective casing. Often used for packaging of electronics, books, or collectibles.
このフィギュアは外箱が少し傷んでいます。
The outer box of this figure is slightly damaged.
外箱を開けると、中に本体と説明書が入っていた。
When I opened the outer box, the main unit and manual were inside.
Compound of 外 (そと, outside) and 箱 (はこ, box), with rendaku voicing of はこ to ばこ. The alternate kanji 函 also means box.