Willie and Poopsie have done that to me! I cannot find them and when I open my bedroom closet, out they come! It is kinda funny because they have done it many times even after being locked in all day!
One day, Willie was unable to get to the litterbox in time and he soiled a few shirts I had on the floor. No big deal. That is what washing machines are for here. I just cleaned it up and all was well. I told Willie not to be sad or sorry because it was not his fault nature called.