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, Hong Kong Port
Address
Room 607, 6th floor, Building M, Feige industrial park, No. 1223, Guanguang Road, Longhua district, Shenzhen, 518109