After the police found what was buried inside, they signaled Leonard and others to leave. Keeping things confidential during an investigation is crucial, and the fewer people who know about certain factors, the better.
However, Leonard and Joan were curious about this case, as they were the ones who initially ended up involved. So when the police left, Leonard to send out a raven to eavesdrop on the police station.
For safety reasons, Leonard refrained from ordering the raven to get too close to the police station, but even so, the snippets of conversation it overheard allowed them to piece together many valuable clues.
According to the police, the two men who were murdered were involved in illicit drug trade, and the broken bags they had been digging up from the ground were used to carry illegal drugs.
Based on the police's analysis, the group that buried the goods had hidden both a box of coins and illegal drugs in the park, only to find them missing upon their return.
