I would recommend talking to your examiner about this.
They are letters to the shareholders, not to the bank itself. If all letters were sent to the home addresses of the shareholders, than I do not think you would include them.
If copies where sent to anyone at any of the bank's addresses, than maybe.
But this is strictly my opinion; I have nothing solid to base this opinion on.
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God made the world in only 7 days... but he didn't have any paperwork.