Lots of good advice already, so I'll just add that once my cat broke into the screentop of my tank and 2 juvenile garters escaped. Neither traps nor tearing the house apart worked quickly but a month later Dante just appeared crawling across my living room floor one day. Three months after the escape Lilith was just smack in the middle of my bedroom when I went in to go to sleep.
So never give up hope!
The Zombie Mama is here!