Just to give you some encouragement, my pain in the a** niece and nephew let out my male Rudis chameleon without asking and lost him and he has been gone for two weeks. I was walking through the yard literally an hour ago and found him about 100 feet away from where his cage was, walking on the ground, patrolling his new area for insects, intruders, etc. He looked great, and was very angry that he was found. I never thought I would see him again and I haven't slept since he went missing. Keep your hopes up. I live on 30 acres in a busy area, surrounded by another 150, so all the raccoons, coyotes, foxes, owls, opossums and every other predator are literally in my front yard nightly. I figured a Blue Jay would have eaten him if the others didn't. You have to realize that, though it does sometimes happen, our predators aren't used to looking for, and eating reptiles, let alone chameleons, here in the Northern part of the U.S (Minnesota, New Jersey, etc), so the chances of them being spotted and eaten are not as high as you would think. Raccoons probably think it is a lawn ornament.
So keep your hopes high!