It's possible that you are:
* Misremembering or mistyping the information. Double-check the source of this information.
* Referring to a specific type of physical release. "Shelf" might refer to a particular type of media format like DVD or Blu-Ray.
* Using a nickname or shorthand specific to a particular community or fan group.
To help me understand and assist you further, please clarify the following:
* What is the context of this term? Where did you encounter it?
* What are you looking for? A specific release date for the Looney Tunes Show, a particular episode, or a specific type of media?
* Do you have any other information about this "Shelf 1.24"? Maybe it's associated with a particular season or episode number?
Once I have more context, I can try to provide you with the information you need.