A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Nearest Port
Shenzhen Yantian Port
Address
Room 202, Building 2, No. 3, Yinghe 2nd Street, Yaoshan, Xiegang Town, Dongguan, Guangdong, China