Question: When does toby come back to the office?

Disambiguated questions and answers:
context: In "Frame Toby", it is revealed that Toby had returned to the office for a week without Michael noticing. When the staff tells Michael that Toby is back, Michael thinks it's a joke until he sees Toby and screams "No God! Please No! No!" Michael asks David Wallace to get rid of Toby but the CFO says he can not fire Toby without cause. Michael then attempts to get Toby fired by giving Pam a fake letter to give to Toby, asking him to hug and kiss her no matter how much she resisted, and taunting the HR rep into punching him, but both plans fail. Michael then tries out Dwight's idea of planting drugs in Toby's desk (unknowingly buying basil from a caprese salad from warehouse workers who he thinks sold him marijuana). However, he does feel guilty about what he has done and, when the police are investigating the "drugs", Michael tells the police that it's a mistake and tries to stop them from arresting Toby. This suggests that, while Michael does hate Toby, there are limits to his hatred. Then again, Toby's reaction to the setup—that it wasted the cops' time that could have been used to deal with law enforcement—inspires more shock and disgust from Michael.
question: What episode does toby come back to the office?
short_answers: Season 5 Episode 9

Frame Toby
wikipage: Toby Flenderson

context: "Frame Toby" is the ninth episode of the fifth season of the television series "The Office", and the show's eighty-first episode overall. The episode aired in the United States on November 20, 2008 on NBC.
question: Which date did the episode air that toby comes back to the office?
short_answers: November 20, 2008
wikipage: Frame Toby

Long answers:
knowledge: content: Toby H. Flenderson[1] is a fictional character on the U.S. comedy television series The Office.
wikipage: Toby Flenderson

content: "Goodbye, Toby" is the fourth season hour-long finale of the American comedy television series The Office, and the show's seventy-first and seventy-second episodes overall. 
wikipage: Goodbye, Toby
long_answer: Toby Flenderson is a fictional character on the U.S. comedy television series The Office who comes back in Season 5, Episode 9 called “Frame Toby.” The episode aired on November 20, 2008.  The character originally left because he was moving to Costa Rica at the end of season four. 

knowledge: content: The Office is an American mockumentary sitcom television series that depicts the everyday work lives of office employees in the Scranton, Pennsylvania, branch of the fictional Dunder Mifflin Paper Company.
wikipage: The Office (American TV series)

content: Dunder Mifflin's Scranton branch is planning a going-away party for Toby Flenderson (Paul Lieberstein) before he leaves for Costa Rica.
wikipage: Goodbye, Toby

content: In this episode, Michael has trouble accepting the fact that his least favorite employee, HR rep Toby, has returned to the office and enlists Dwight's help to frame him for using drugs so he will be fired.
wikipage: Frame Toby
long_answer: The Office is an American mockumentary sitcom television series that depicts the everyday work lives of office employees in the Scranton, Pennsylvania, branch of the fictional Dunder Mifflin Paper Company. In the show, Toby Flenderson leaves the company for Costa Rica. In season 5 episode 9, Frame Toby, Toby returns to work and Michael enlists Dwight's help to frame him for using drugs so he will be fired. The episode aired in the United States on November 20, 2008 on NBC.