Im quite new to china suppliers, but if you have not already i would suggest you try some searches of the net on the information you can find on their site, like contact names, addresses, company name etc.
Whenever i see a thread like this pop up some people do a whois lookup on the domain name, then see if the info matches to where they say they have factories etc.
I came across a forium which had a list of sites that are suspected to be scammer here
http://www.fraudwatchers.org/forums/...ead.php?t=7058 maybe there in that. If you cannot find anything on searches, why not just cantact them and see how they answer your questions, from what i have read on this and other forums you can usually tell if they are scamming by how they answer questions. (dont quote me on that though) All i know for sure is you get alot of fake stuff from china LOL
hope this helps you in someway till a more experienced member can offer a suggestion.