Depending on the trap, they may not get caught in it. Look around for a mouse body.

My favorite mice catchers are cats. But sometimes, cats cannot be called in to eradicate a mouse.

They like cardboard and anything that has the scent of food. Once the items are touched by their waste, it's contaminated and you may have lost what was there.

Such pests!! Hope you are able to get them out of your home!