My only response is that I am not certain what purpose it serves. The previous exemption process included a customer certification and Treasury omitted it. If they don't want it, I am not certain why you would. Moreover, you are responsible for the propriety of an exemption and no statement from the customer will change that. The only real downside I can think of is that it might confuse the examiner.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.