Alpha Cat Puzzle Twist

Here's the Twist:
The puzzle ON the box is more than a bit different from the puzzle IN the box.  What happened here?

About the Artist:
Alpha Cat showcases the charming artistry of Krista Hamrick, whose whimsical illustrations are full of warmth, personality, and playful detail. This feline-friendly alphabet celebrates cats of all kinds—from Burmese to Siamese (or perhaps a different kitty altogether)—in a purr-fectly delightful puzzle for cat lovers and puzzlers alike!