However, although I am not at home and don't have access to all my files, I did check a hard drive with some material on it and came across a newspaper clip from the days of the HSCA. It does not say the name of the paper or an exact date, but mentions that HSCA investigators had finished talking to Audrey Bell. In the article it says that another Patrolman named C. Harbison was also given 3 fragments of a bullet that came from Connally's body. He turned them over to the FBI. My initial thought was that he must have been the other plain clothes officer with Nolan, but the article says that Harbison was given the three fragments on 11/25/63. Three days after Bell gave her fragments to Nolan. I wonder what happened to Harbison's fragments and why he - according to the article - was never called to testify.....
I would suggest to you that the newspaper article got it wrong.
It does not say in the ARRB report that she was shown a photocopy nor that she could only make out the large fragment. And she did in fact say that the fragments were too small!
The ARRB report says: "When shown CE 842 (page 841 in Warren Commission Volume XVII), she said that the fragment(s) photographed in the container were too small, and were too few in number, to represent what she handled on 11/22/63."
She was shown an image of the fragments, not the actual fragments.
The image of the fragments on the top of page 841 in Warren Commission Volume XVII is not of very good quality. Bell makes a reference to photocopy. The ARRB report on the interview was done by Doug Horne. He misrepresented what Audrey Bell said in the interview. Or at least the intent of her statement. She looked at it and only saw one fragment and was adamant that there had been at least three. After looking at it a bit she said that it was hard to tell what those other things in the image were. Gunn then told her that they were in fact part of the photographic image. He notes that it was unclear as to what they were. Which makes it obvious that she was not shown a good quality image. They were the other three fragments. Bell did not state outright that the fragment(s) were too small.
https://www.maryferrell.org/pages/ARRB_Medical_Interviews.html