You should have gotten a weird, black, cheap sack to put them in. Better than nothing but, having had cats, it won't stop them for long. I've seen them saw through plastic-jacketed steel-mesh braided HDTV cable. I mean, why? Because the cat felt like it, that's why. Lol.
Mine was purchased b stock and never came with any sack. There's no way for my cat to get into the cabinet at least.