Not that was recorded, so far as I am aware, and highly unlikely given the lack of mention despite all of the Longstreet sightings around the field. It could attract unwanted attention from enemy artillery or advanced skirmishers. We may guess General Lee's thoughts on the subject based on his thinly veiled reproof of Major Dearing, who liked to ride around accompanied by a flag, which did attract enemy fire, and for that reason displeased his men, who did not appreciate the extra attention being paid to them.