Hey. Sorry that happened. Was your nestbox on a tree or fence? That sounds like a raccoon.
A house wren wouldn’t have removed the entire nest. They would have built on top. If you have wren problem it’s best if you put on a wren guard after they lay a first egg again. Have you had wrens take over nests by putting sticks in it? Usually house sparrows are more of a problem than house wrens are but house wrens can be a difficult problem.
Make sure the pole is far enough away from a tree or fencing where a raccoon can’t jump on it and make sure the baffle is near the top of the pole,a couple inches under the nestbox.