I had to a find a supplier from China in 2010 and starting from June 2010 to November I was scanning and scanning. How many times I was already going to send money over and only in the very last minute reconsidered.
Finally in November found a service company in China that provided let's say "background check" solutions. A little overcharge but I received goods working and all complete.
I'll bring over my stats from Alibaba or Aliexpress. 6 of 10 suppliers I talked were professional fraudsters.. and AliExpress (an Alibaba Company) does not verify or guarantee anything, though it supposed to do escrow there - it does not!
There should be common sense to avoid this guys, however there are some very professional ones.