DishComm nails this. Looking at this link of blackout rules for Center Ice on cable (not E*):
http://www.tsq.com/alerts\NHL Center Ice Blackouts 2006 2007.pdf
On the next to last page Massillon, OH which is just west of Canton is listed as a "Sphere" blackout zone for the Penguins. The NHL hides most of this stuff from self service on their website, so this is from a vendor that provides a programming service to cable systems.
Sucks that the OP's region gets claimed by the Pens to the NHL but is not offered Fox Sports Pittsburgh as an RSN. Seems like that's out of whack.
NHL blackout policies don't care that you can't get the RSN channel. Just that it's on the Pen's RSN feed as available to fans and the Pens claim the region, so he's hosed.
If you the OP had the Sports Pack, the game was replayed on FSP at 11pm ET last night and he could have watched it then as the blackout would only apply to the original broadcast window. It wasn't that great a game as far as game 7s go compared to the tension and drama of the first 6. Both teams are great, but this one was decided early on.
As the Pens go forward, it won't matter as the RSN's only cover the first 2 rounds. So Versus will not be blacked out for the Eastern Conference Finals or Cup Finals.