OK, you let the snake roam free. I don't agree with your choice, but am not going to go on the attack. Anyway, lets end this here. It's spamming the thread and taking away from those trying to help the OP.
Back on topic, I've never found a missing snake more than 10 feet from its cage. I also suggest using tin foil if you have a carpet floor. It does the same thing as flour on carpet, and is easier to clean up. Just lay long sheets of it out (Shiny side down), and watch for snake trail shaped crinkles in the foil. I have a friend who has used this method a few times, and it always worked for him.