On the side of the shed east of the small pond north of Oakland, behind the fence.The boxcar is at the end of the train tracks with a restricted area neighboring it. In a box car at Bayview Rise, southeast of downtown San Francisco.When the glyph is viewed in NetHack View, a single symbol will appear that the player should take note of. The glyphs can be found in (listed in order of NetHack Glyphs) After a picture of it is taken, an audio log will play, depicting a 'lost footage' style recording of one of the Shuffler Four, the teenagers who attempted to record the documentary. When looked at in the camera, a notification flashes at the top of the screen, all four graffiti piecing together a sentence. In one of four different locations, the player can find bloody graffiti that when approached emits a disturbing shuffling noise. The event is unmarked, and doesn't appear in the DedSec App. The glyphs are immediately available in the open world when the player regains control of Marcus after the Swelter Skelter event.
The Shuffler side quest can only be started after the Swelter Skelter, when the player has T-Bone in their main hackerspace. The markings emit an eerie humming sound when approached. The only hints to its appearance are the bloody graffiti found around the map and the items it seems to 'reward' the protagonist with upon completing the quest.
The Shuffler does not physically appear in-game, though the game's files indicate it is an in-game entity, verifying that it is to some degree a character. This outfit gives Marcus an alternative takedown animation, where he crushes an enemy with a flurry of malevolent, crimson symbols and shuffling noises. While T-Bone provides some insight into the legend, Josh is less than amused and seeks to prove that the Shuffler legend is only a myth. After following the trail of the Shuffler graffiti, Marcus was lead to an underpass north of the Umbarcadero Center where he experienced something akin to a hallucination or psychic assault, where upon awakening he was presented with a unique outfit covered in the Shuffler's runes. Upon taking a picture of it, he downloaded an audio message, presumably a copy of one of the audio tapes from the missing Shuffler Four. In 2016, Marcus Holloway stumbled upon one of the strange, bloody markings associated with the Shuffler.
A few hundred disappearances around San Francisco can be attributed to this legend, though no concrete evidence ever surfaced until modern times, when four teenagers attempted to film a Shuffler documentary, only to go missing and leave behind a quartet of audio tapes that the SFPD confiscated. An unknown amount of time before the events of Watch Dogs 2, the Shuffler legend was conceived in the Bay Area as a creature that lived 'between worlds', and often followed leyline-like paths like railroads to steal people into its dimension for an unknown purpose.