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
91, Jinxiu Danfeng Court, No. 1 Biyuan Road, Tanzhou No. 3 Industrial Zone, Gd. P. R. C, Zhongshan, Guangdong, China