February 6. On this date in 1981, the National Spiritual Assembly of the Bahá'ís of the United State wrote "We would like to point out to you that the National Spiritual Assembly has no documentation verifying the authenticity of the illustrations in Mr. William McElwee Miller's book, and as such they cannot be regarded as being of Bahá'u'lláh and the Bab."

February 6. On this date in 1981, the National Spiritual Assembly of the Bahá'ís of the United State wrote (also here) "We would like to point out to you that the National Spiritual Assembly has no documentation verifying the authenticity of the illustrations in Mr. William McElwee Miller's book, and as such they cannot be regarded as being of Bahá'u'lláh and the Bab."

One year previous, on March 30, 1980, the Universal House of Justice had written "The picture on page 83 of William Miller's book is a portrait of Bahá'u'lláh, but different from the one displayed in the International Archives."

"We would like to point out to you that the National Spiritual Assembly has no documentation verifying the authenticity of the illustrations in Mr. William McElwee Miller's book, and as such they cannot be regarded as being of Bahá'u'lláh and the Bab."
Letter from the National Spiritual Assembly of the Bahá'ís of the United States to an individual 6 February 1981

"The picture on page 83 of William Miller's book, but different from the one displayed in the International Archives."
Universal House of Justice to an individual 30 March 1980