If you use HBO GO the Boardwalk Empire Episodes are free.
As a test I said into the voice remote "HBO on demand Boardwalk Empire" and the episodes in season 2 were all free.
If I just press the Xfinity button and navigate to HBO to stream Board walk Empire episode 3-12 in season 2 cost $2.99 to stream.
Looks like how you navigate to the stream dictates if you have to pay or not.
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