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 Port
Address
South Side, 2F, Building 1, Hongfa Jiateli High-tech Park, Shixin Community, Shiyan Street, Bao'an District, Shenzhen, 518101