When Leonard and Daniel return to the halfway house, they find one of the residents passed out in the hallway. They then hear a commotion out back. As they cautiously approach the shed, they continue to hear noises, and they even call out to ask if someone's there. When they open the shed door, they find Alfie dead. During the police investigation, neither men ever bring up the fact they heard noises just before finding Alfie's body. That would've been a huge help on solving the crime.