We've known for a while, that Ben Savage would guest star on Bones somewhere in season 7, but know we know exactly where: Episode 4 - "The Male in the Mail."
Here's a description straight from Fox:
Dismembered remains are discovered in several mailing boxes at a dead letter office, and the Jeffersonian team identifies the victim as an employee of a local Ship 'n' Print, where the staff recently split the winnings of a lottery prize. The team uncovers a complicated love triangle between two married employees and the victim, and while motive points to the husband (guest star Ben Savage), a critical clue leads them to solve the crime definitively. Meanwhile, Booth's grandfather (guest star Ralph Waite) breaks some unexpected news, and Special Agent Genny Shaw (guest star Tina Majorino) learns the importance of teamwork in the all-new "The Male in the Mail."
Dead letter office indeed! We're not looking past Episode 3, "The Prince in the Plastic," but we can't wait for this one either!