color_to_turtle.json in databoxes.zip\data\vb\item_modifiers

{
  "function": "minecraft:filtered",
  "item_filter": {
    "predicates": [
      {
        "condition": "minecraft:any_of",
        "terms": [
          {
            "condition": "minecraft:match_tool",
            "predicate": {
              "items": [
                "minecraft:shulker_box",
                "minecraft:white_shulker_box",
                "minecraft:orange_shulker_box",
                "minecraft:magenta_shulker_box",
                "minecraft:light_blue_shulker_box",
                "minecraft:yellow_shulker_box",
                "minecraft:lime_shulker_box",
                "minecraft:pink_shulker_box",
                "minecraft:gray_shulker_box",
                "minecraft:light_gray_shulker_box",
                "minecraft:cyan_shulker_box",
                "minecraft:purple_shulker_box",
                "minecraft:blue_shulker_box",
                "minecraft:brown_shulker_box",
                "minecraft:red_shulker_box",
                "minecraft:black_shulker_box"
              ]
            }
          }
        ]
      },
      {
        "condition": "minecraft:custom_data",
        "tag": "{turtle_data:1b}"
      }
    ]
  },
  "modifier": {
    "function": "minecraft:set_item",
    "item": "minecraft:green_shulker_box"
  }
}