If you are at a show and you take the time to talk and meet people, you can find out where the stuff comes from where it is going etc. All it takes is a little effort to have all questions answered.
I go to every show, auction, flea market, yard sale, Internet , homes etc. , that I can. I also talk way too much ! I find it is easy to find things, the hard part is to afford things. There are always bargains to be found if you put out the effort.