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.
Address
D1403-1, Block Abcd, Building 3, Tian'an Yungu Industrial Park, Gangtou Community, Bantian Street, Longgang District, Shenzhen City, Shenzhen, Guangdong, China