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
8-9/F, 6th Blook, Zhongyuntai Sci-Tech Industrial Park, No. 1 Road, Tangtou Village, Shiyan Office, Bao'an District, Shenzhen, Guangdong, China