In the days that followed Gao Rou had sent men to the Shanxi, specifically to survey the location, where the public phone was located. They hoped that they could catch Gao Rou's mysterious caller on the act of making contact. It was a payphone by the street which was pretty much accessible to just anyone else.
Gao Rou's men, however, found out that it was conveniently located near a bank and thus, they began to work on accessing the bank's surveillance, something that Luis had become good at as of recently. They considered the possibility that the bank may have cameras from outside the building.
Lu Wei also took the initiative of sending men to his old workers, those that were working in the mansion even before Gao Chaoxiang's death.