: They track the gun to a woman named "Miss Birdy," who informs them she threw away the materials the gun was wrapped in.
: Burgess and Roman are assigned to a gun buyback program but discover a weapon linked to a triple homicide. [S2E4] Chicken, Dynamite, Chainsaw
They use the game to determine who has to perform the unpleasant task of for evidence—specifically the paper and rags that a triple homicide weapon was wrapped in. : They track the gun to a woman
Chicken, Dynamite, Chainsaw - Chicago P.D. (Season 2, Episode 4) Chainsaw - Chicago P.D. (Season 2