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
Building 14, Zhongsiyuan, No. 12, Nanxin Road, Nanling Village, Nanwan Street, Longgang District, Shenzhen 518123, Shenzhen, Guangdong, China