Gad, did you miss the part about all ballots having been scanned?  Destroying the paper ballots is standard practice in virtually all organisations' elections.  But the records remain. 

Try as you might to belittle the Conservative's electoral process, it is light years ahead of any process the Liberals have . . . after all, the Liberal process gave us the airhead Trudeau, who as prime minister has a very long list of "Fails," and a very, very short list of "Completed Initiatives."