Which webisode series follows Oscar, Angela, and Kevin finding missing office money?

The webisode series that follows Oscar, Angela, and Kevin searching for missing office money is The Accountants.

NBC released the ten-part online series between the second and third seasons of The Office, beginning on July 13, 2006. The three accountants discover that $3,000 appears to be missing from Dunder Mifflin’s office budget, so they question their co-workers and investigate one another.

The mystery eventually turns into a character comedy built around the trio’s very different personalities. Oscar approaches the problem analytically, Angela treats it as a serious accounting matter, and Kevin is enthusiastic but frequently confused. Their investigation implicates several colleagues, including Michael and Meredith, before the final episode reveals that the missing money resulted from an accounting mistake made by Angela.

The Accountants was directed by Randall Einhorn and written by Michael Schur and Paul Lieberstein. It won a Daytime Emmy for Outstanding Broadband Program—Comedy in 2007, helping establish The Office webisodes as more than disposable promotional extras.