Searching For Sidney

I hated to tell her that Sidney was probably in another state by now. I'm not sure what a mouse's rate of travel would be, but it's been several weeks since Lizzie brought him in the house and, with a very satisfied look on her face, dropped him at my feet. He promptly hid and for a day or so I tried to find him, finally leaving a window open for him so he could escape. I'm pretty sure he took advantage of it and has successfully relocated by now. I'm trying to discourage Lizzie's efforts to reunite with Sidney but she goes out on patrol anyway. As a precaution, I make her meow at the door when she wants in so I can be sure she doesn't have anything in her mouth.