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
6 / F, Building 3, No. 10, Xinsheng Science Park, Xianxianxiang Road, Xianrenling Village, Xinsheng Community, Longgang District, Shenzhen, Guangdong, China