Illegal. It is illegal to exchange a large amount of foreign currency found in the garbage dump. 20 10 the Supreme People's Procuratorate and the Ministry of Public Security's Provisions on the Standards for Filing and Prosecuting Criminal Cases under the Jurisdiction of Public Security Organs (II) stipulate that illegal trading of foreign exchange is convicted and punished for the crime of illegal business operation, among which Article 4 of the Decision on Punishing the Crime of Fraudulent Purchase of Foreign Exchange, Evasion of Foreign Exchange and Illegal Trading of Foreign Exchange stipulates that illegal trading of foreign exchange outside the trading places stipulated by the state disturbs the market order and the circumstances are bad.