It's simple. The real ones have a shiny or polished surface. The phoney ones are dull. The reason is simple. The stalks of grains in the real ones are all bent at ninety dgrees without damaging the stalk. The bent parts all line in the same plane, creating the polished effect. The phoney ones are pushed over by a large board or similar means, and are lying willy nilly so can't shine.
Posted by CliffR
This is the article he is referring to http://www.rumormillnews.com/cgi-bin/forum.cgi?read=210015