It isn't until Murch, disguised as the grunting muscle man Chicken, threatens Abe with being thrown down an elevator shaft, that Abe gives up the location of the diamond—his safe deposit box, and he also gives up the key to it.
It isn't until Murch, impersonating the grunting muscle man Chicken, suggests Abe will be sent plummeting into an elevator shaft that Abe discloses the location of his diamond—his safe deposit box, and also hands over the key to it.