We finally found some larvae!

You know how some shelves are adjustable? There's all those holes drilled in a neat line? Well, DH got to looking and some of them were plugged. He poked them with a toothpick and there were little ugly LIVE worms in them!

The description matches: "Larvae have light body, dark head"

We still have moths, but at least we're making progress! (Haven't called the pest control yet -- we'll see how it goes first).