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
Room 5064, Building W1-A, Gaoxin Industrial Village, No. 034, Gaoxin South 4th Road, Gaoxin District Community, Yuehai Street, Nanshan District, Shenzhen