The Black Pond Turtles, which are listed as a "vulnerable" species, were smuggled from Pakistan to Taxkorgan in China's Xinjiang autonomous region in June.
According to a Chinese government statement, the turtles were found on a truck. Authorities arrested a suspect and then five would-be buyers.
Pakistani wildlife officials in August travelled by road to bring the turtles back home to a sanctuary in the town of Sukkur 470 kilometres north of Karachi in Sindh province, where they were held in quarantine.
The black turtles, which feeds on plants, fish and shrimp, are also found in India's Ganges as well as the rivers of Bangladesh and Nepal.