Наш спецназ S01E19 - Последнее золото Скифа

Firsov and his fighters arrive to apprehend the hijacker who shot down the policeman. The phone address was provided by an anonymous source. There is no hijacker in the garage. There was a gold deal going on there. Judging by the piece of precious metal dropped by the escaped seller, Firsov understands that the gold is criminal. Where did it come from and why did anonymous want to disrupt the deal?