original box
Refers to the box a product originally came in, often kept for storage, resale, or collection purposes.
このフィギュアは元箱に入れて保管しています。
I keep this figure stored in its original box.
買った時の元箱がまだある。
I still have the original box from when I bought it.
Compound of 元 (moto, 'origin') and 箱 (hako, 'box'), with rendaku voicing of はこ to ばこ.