Hy-Vee Shrinking Cereal Boxes?

Here's a 100% breakfast blog post: is it just me, or are Hy-Vee's cereal boxes getting smaller? I'm looking at my Honey Oats & Flakes and Cocoa Peanut Butter cereal (you know, the one with the cute little alien corn puff in a flying saucer!). They look small. They say "13 oz." I could swear these boxes were 16 oz. just a couple months ago. Could my favorite out-of-town grocery store be pulling that old trick of keeping prices the same but giving us less? Perish the thought!