"blind box" meaning in English

{
  "forms": [
    {
      "form": "blind boxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blind box (plural blind boxes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A box containing a collectible, which is one of a set; one does not know which collectible is in the box until opening the box."
      ],
      "id": "en-blind_box-en-noun-vEJZIw9W",
      "links": [
        [
          "box",
          "box"
        ],
        [
          "collectible",
          "collectible"
        ]
      ],
      "related": [
        {
          "word": "loot box"
        },
        {
          "word": "gacha"
        }
      ],
      "synonyms": [
        {
          "word": "mystery box"
        }
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "mánghé",
          "sense": "box",
          "word": "盲盒"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "box",
          "word": "yllätyslaatikko"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "box",
          "tags": [
            "feminine"
          ],
          "word": "boîte aveugle"
        }
      ]
    }
  ],
  "word": "blind box"
}

{
  "forms": [
    {
      "form": "blind boxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blind box (plural blind boxes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "loot box"
    },
    {
      "word": "gacha"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Mandarin terms with redundant transliterations"
      ],
      "glosses": [
        "A box containing a collectible, which is one of a set; one does not know which collectible is in the box until opening the box."
      ],
      "links": [
        [
          "box",
          "box"
        ],
        [
          "collectible",
          "collectible"
        ]
      ],
      "synonyms": [
        {
          "word": "mystery box"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "mánghé",
      "sense": "box",
      "word": "盲盒"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "box",
      "word": "yllätyslaatikko"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "box",
      "tags": [
        "feminine"
      ],
      "word": "boîte aveugle"
    }
  ],
  "word": "blind box"
}