The collector who I buy my Chinese pterosaur fossils from gave me some info about Psitaccosaurus fossils since I inquired about one he had. I thought I will share it here in case anybody is considering thinking about buying one. He isn't a commercial seller--a collector who sells fossils he finds and on behalf of fossil collectors, who I hope it doesn't break the rules of discussing sellers to post what he informed me. Think it's useful for people to know
"The Psittacosaurus fossil. Please always remember that you get what you pay for.
Most Psittacosaurus are chucked together. It is impossible to get a complete one now. So, worker would keep all pieces and when they can make up a complete body, they will do it easily. We can't judge it just from the pictures."
So, it seems that they are all composited over a period of time, to such an extent that it is very difficult to tell the difference.
He also sent two photos which I have also attached showing composited Psitaccosaurus which, to my eye look very well done.