It is not uncommon for "dummy statues" to be used.
I know that the Grammy's use "dummy statues," at least for some of the award winners. I would assume that the winners of the major awards that are televised get to take their awards with them so that they can be seen carrying them all over to the after parties, but not everyone gets their awards that night.
Last summer I was working for an artist (who attended the actual awards cermony) who produced on a Grammy Award winning album. We recevied his award via UPS in June, how many months later. Talk about a shock when I opened the box to find the foam wrapped award.
In case anyone is curious, a Grammy is about the same size in person as they are on TV.
"Take all of your so-called problems, better put them in quotations.." - JM