Iirc I'm pretty sure I read somewhere (probably from Adam Kimelman, who follows the camp for nhl.com) that every player would get a rest at some point during the camp. They're playing a lot of games in a short space of time, I'm sure he'll be back for the remaining games.
Interview with Sarnia head coach Jacques Beaulieu with some tidbits about Reid Boucher. Here's a rough transcription:
Q: The other American that you're bringing that played with the USNDTP last year is Reid Boucher. He described himself as a tenacious forechecker, two way guy. What do you expect out of him?"
A: The thing with Reid is that we're going to play him with Nail [Yakupov] and Alex [Galchenyuk]. We know he's a pure shooter and goal scorer. And scores timely goals, if you look as his career so far, he's scored some big goals for USA Hockey. I think he had a good camp with Jersey this year and I think Jersey is pretty happy about his decision to come to Sarnia because of the fast track to the NHL. We're expecting some huge things out of him, I think he's another guy that could score 30 to 40. Playing with those two guys, he's going to get opportunities. Those two guys love to pass the puck and he loves to shoot, so it's a pretty good mixture. He's tenacious, he's puck hungry, he likes to get in on the forecheck and there's a little bite to his game too. He plays a hard brand of hockey.