If you really want to find a reliable long-term supplier in China, the best way is visiting their factory and let them show the license.
Seeing is believing.
Of course, the trust is built on the base of each other's transactions, anything has its first time. So you can start your business with a small quantity at first to test the water. If everything is meeting your requirements, then you can enlarge your transaction slowly.
As a Handbag Factory, we have been doing our business with foreign customers like that for a long time.
Last edited by laocial; 01-15-2009 at 12:10 AM.