Continuity mistake: When Atlas walks in to the Octa phone launch disguised as a waiter he has a silver tray. Someone rearranges something on it as he walks down the corridor and it is plainly a silver tray. He walks through after the rearrangement and the next shot there is a briefcase visible under the tray. The tray is supposed to be a tray that becomes a briefcase but is too thin to do that. When first seen there is no space for the briefcase part to be closed up against the tray.
Picture added by Casual Person