In "Whistleblower", the season finale, Jo comes to Scranton determined to find out who leaked information to the press about Sabre's printers catching on fire.
Dwight then bursts in with chemicals to spray for bed bugs, and Jim tells him a bug is following Cathy.
Later in season 8, Nellie Bertram re-appears, having been hired (off-screen) by Jo as Sabre's President of Special Projects.
At the end of season 8, it is announced that Jo Bennett has sold Dunder Mifflin to David Wallace.
She is not shown returning from Florida with her co-workers, Devon White (Devon Abner) is an office worker in Supplier Relations.
He was an office employee who sat across from Creed (who was directly responsible for getting Devon fired, to save his own job).