private void OnCollectionDataChanged(EventData e)
    {
        Debug.Log("Collection data changed! Updating UI...");
        DataSnapshot dataList = (DataSnapshot)e.Data["box_list"];

        Debug.Log(dataList.GetRawJsonValue());
        CollectionData collection = JsonUtility.FromJson <CollectionData>(dataList.GetRawJsonValue());

        BoxList.UpdateList(collection);
    }