Despite the arrests carried out by the New York Police Department against members of the Morello gang, the investigations into the crime of the barrel do not seem to bring decisive elements for the resolution of the case. The turning point came with the arrival of an anonymous letter. In which it was written verbatim:
“I know who the man found in the barrel is. He came from Buffalo to get some money ... he was convicted of selling counterfeit banknotes. The police have arrested the right people, get inmate Giuseppe Di Primo to Sing Sing, promise him freedom, and he will tell you many things, do as I tell you and you will know everything. We salute you. Your friends S.T. "