At my house in the Bay Area I’ve had opossum invasions. They are impressive diggers. One dug under the foundation that had more than normal exposure to the outside. Another literally tore off 1/4″ wire cloth to gain entry. I would walk around the entire foundation and look carefully. But he/they were smart enough to realize that when I blocked their entry points they didn’t try again.
On another occasion I set a large trap. First I caught the neighbors cat, then a raccoon. But then I got the opossum. I took the cage twenty miles away into the hills and let him go.