We have one of those live animal traps, I think it's called "have a heart", that we bought a long time ago to try and catch some critter that was getting into our attic and I have thought that it might come in handy if any of our rabbits ever escaped. I would be a little worried though that if they did trip the door that the sound of it slamming shut might scare them to death. I would probably put that out as well as put out food in an open exercise pen or something and still do a search around the house and neighborhood. Luckily, my rabbits have never escaped. I have carelessly left the door of the exercise pen open a couple of times with the same rabbit, Smokey. Once he was in the garage with the door closed and the other time he was on our deck so he was not out in the open per se. He had a little adventure sniffing around outside the pen, but he was exploring very slowly and cautiously so I just approached him slowly as well and he either went back in the pen by himself or I was able to pick him up.