Don't give up, and don't stop looking. I remember someone here who's bird disappeared, and was found 3 days later, inside their couch. He had climbed up into the upholstery! He was fine, just scared & hungry. Keep things as quiet as you can, and listen for peeps, etc. Remember, birds are prey in the wild, and are masters at hiding & staying still. I couldn't find a parrotlet that was hiding in plain sight, but, was so quiet & still, we overlooked him several times. Good luck, you'll find him.