Bones - Season 7 Episode 4
The Male in the Mail

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 a critical clue leads them to solve the crime definitively.