I would call the local police, see if they have heard anything - if shlters and vets aren't opne, maybe someone called them? Maybe, depending on how many roads are in your area, take them for a ride and see if they react at a certain house? I'd go today and put "found dogs" notice up at any supermarket or conveniece store that's open. Don't put a lot of detail, just enough so tht you can be sure whoever calls really is their owner. Bless you for keeping them safe for now.

Poor Angus, it'll be okay soon ...