Glad I helped, Anita.
I think the markings have some legal meaning in China very similar to what they mean here. And even if they meant something different, it would not be legal to import them into the US if the markings are not up to US standards. The FTC guidelines are the right place to start to understand exactly what they mean in the us.
Let me tell you a sad story. UK and Europe and fussier that we are in the US. We allow a little slop in the quality to allow for solder which has less precious metal to allow it to flow at a lower temperature. Some friends manufacture sterling and turquoise jewelry in Albuquerque. They use sterling and real stones. They shipped to a customer in France a package of goods marked .925. French customs decided to test some. They pull the stone and melt the piece and assay the ingot. It tested less than .925. That made it illegal to import into France. French customs ran all the jewelry through a crusher and returned it to my friends. Totally ruined!!! An expensive lesson. Now anything they ship to Europe is stamped .800 because they know it will assay at least 80% silver.
Tell your supplier who said that they were told the markings were decorative to threaten to report the importer to US customs based on the FTC rules.
The FTC guidelines are on line. See http://www.ftc.gov/bcp/guides/jewel-gd.htm