Get them a big enough water area or let them free to find a water area and look forward to baby toads all over your yard soon. It's much easier to take a little baby into captivity than toads that size. It doesn't sound as if you have the resources to care for eggs, tadpoles and toadlets anyway. I'm not trying to be mean, just trying to help you realize what is best for the toads. Plus, it's going to start heating up soon and the toads will die trapped in that rabbit cage, unable to get to the cooling resources that they need.