Perhaps you don't understand how the USDA labeling works. If it says "Ground Beef" it's all beef but it can be from any part of the cow. You want Chuck or Sirloin, that's labeled as such.
Thanks for the clarification. When I bought ground beef I usually got the ground chuck. The ground “beef” was too fatty for my taste and just didn’t seem right. It might have been the processed part of the beef I was noticing.