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I would recommend filing a petition for immediate custody of your grandson. The petition can be an emergency ex parte under the circumstances and based upon your allegations. Grandparents have rights via statue to file for custody and or visitation. I would continue your efforts with CPS and police to try to find location of grandson. I do recommend continuing your pursuit of grandson in the interim so that way you have an order in place once they are located to obtain the child and have a right to the grandson. Have an order in place would also ensure that if CPS obtained custody of the child he is placed with you as opposed to a foster family.
Jurisdiction will be where the child resided on a primary basis in the last 6 months. I would advise hiring an attorney. If you wish to try to pursue it yourself you will need to go to the law library to obtain assistance drafting of pleadings. The first putting will be entitled emergency petition for ex parte order of sole lphysical custody.