Well, if you hamster is lost close every door when you're out hunting for him/her. Take a bucket or container and put food and bedding in it. Put one of those in every room in the house including the garage and attic. Your hamster could be ANYWHERE! If your hamster is hungry enough, your hamster will come to the food. Have your pets including a dog or cat, leave the house or put in a kennel so if won't eat or kill/injure your hamster. Keep all outlets blocked with a plastic cover. Hopefully, you will find a safe hamster.