The "Investigation Information" sheet given by Marcus to the other police officers during their search for Eddie Ross states: "Before his death, Eddie Ross was known to be digging in the Brooklyn area in an attempt to uncover video games that were disposed of on c.1980." This is several scenes before Sherlock and his associates discover that he is searching for the Nottingham Knights game cartridges.
When Sherlock, Joan, Detective Bell and Ostrin are at the shed housing the recovered Nottingham Knights game cartridges. When Joan handed the game back to Ostrin the next view shows the game still in Joan's hands.