My past thread was locked almost instantly without notice and I'm guessing it's because I didn't provide an explanation to my picture. I apologize to the moderators and will provide a description on how I found it.
The banner was found by inputting the ID of the Independence Day Special update into a generic Xbox banner URL.
Example (The Xs represent the ID): http://download.xbox.com/content/images/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/1033/banner.png
Independence Day ID: 5afd86e8-bb84-44d6-9cad-5b945ab41ae2
End Result: http://download.xbox.com/content/images/5afd86e8-bb84-44d6-9cad-5b945ab41ae2/1033/banner.png
Now as soon as I posted my first thread, Xbox removed the banner and replaced it with a placeholder. I was, fortunately able to save the image and upload it to a file hosting website before this happened just in case.









