A blind reading of the Boast Busters script was done at a panel at Canterlot Gardens, featuring some of the greatest voice talent in the western hemisphere (Tara Strong, John DiMaggio, Grey DeLisle, D.C. Douglas, Quinton Flynn and Jeniffer Hale). It was an amazing panel that can be viewed here.
I tried to synch up what was read with the actual episode, though obviously a lot had to be cut out. Watch the original panel if you can, because this is a very condensed version. I won't say here what voices are done, if you haven't seen the original panel have fun trying to guess them!
Canterlot Gardens VA Panel - Boast Busters... by Nearphotison