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
1f 103, No. 3 Building, Maibaole Industrial Zone, Jiangshi Road, Shiwei Community, Matian Street, Shenzhen City, China 518106, Shenzhen, Guangdong, China