Co-creator and executive producer of the show, Bill Prady, said in an interview that they wrote "something like a Batman cookie jar" into the script of the episode and were then surprised that they were indeed produce.
Given to Sheldon by Leonard in season 1, this awesome cookie jar is very hard to find. It is a Limited Edition of 3600 figures from Dc Comics and Vandor, and are no longer in stock. When it is on eBay, it can sell for $200-$400. Not only does it ward off criminals, but it’s also a cool place to store your oatmeal raisin cookies.