You didn`t read correctly.
Elite Athletes, marathon runners, can store 1800-2000 calories worth of Glycogen. That is less than half of a 1 LB.
That is on the high end of the spectrum and including Liver Glucose, Brain Glucose and "Blood" Glucose.
Muscles are made up of about 1 percent of Glucose.
Also, different muscles store different amounts of Glycogen so its is indeterminable regarding caloric storage amounts for each muscle, unless measured.