I'm afraid they've come topside a little more frequently. Most of them are rather upset by the rain that's happening in the kingdom. The vast majority aren't used to that sort of weather. I'm sure he's back where he was found, however. Once they claim a spot as theirs, it's theirs, whether trapped or let go elsewhere.
I've seen goblins travel several hundred miles to get back to their dwelling place. Good luck with attempting to rid yourself of it.