When as the DVD box set of the simposon's season that included the episode that Mr. Burns starts to miss his childhood teddy bear released in region 1 ?
The Simpsons (season 5):  The DVD box set was released in Region 1 on December 21, 2004, Region 2 on March 21, 2005, and Region 4 on March 23, 2005. Rosebud (The Simpsons):  The episode begins by showing how on the eve of his birthday, Mr. Burns starts to miss his childhood teddy bear Bobo.
December 21, 2004