I am so sorry to hear about Barry.... what a horrible week and to be in search of him not knowing, any parent's worst fear...
Bronx suggestion of enlisting the help of kids was actually my thought too! When one of our cats was lost, we offered the kids in the neighborhood a reward even to even just locate him. They were all over the place searching for him, literally no stone unturned.
I wish you the best of luck and will keep hoping for Barry to be waiting at the front door for you any moment.