I recently had a LNF approved which had breakfast, and noted the reservation did not mention breakfast afterwards. I replied to the initial LNF email and had the following reply:
Thank you for your additional inquiry regarding Marriott's Look No Further (SM) Guarantee. We appreciate this opportunity to clarify the matter at hand.
Because your original Marriott reservation and the comparison reservation included breakfast, your approved rate would also include breakfast. This information has been noted upon the reservation that is in question; our associates at the hotel are aware of the circumstances.
Thank you for choosing Marriott.