Joe, I'm thinking they might be under our porch or the neighbors'.
We have one of those Have-a-Heart traps and used it to catch stray cats (to set them free somewhere else or called animal control for a friendly cat). If we were to catch the skunks, wouldn't they spray us, if we came near the trap?????
I have to tell you, I have never had the pleasure of that experience and I NEVER want to experience that!