Whenever Paisley took off in flight, I was able to find him by calling his name and staying quiet for a minute to listen for his rasps, then move more and repeat. Of course Paisley did this during the day and he was alone, plus that was his first flight of any diatance, so of course he was terrified and was looking for someone to save him as desperately as I was looking for him. Anytime my big ducks weren't in there usual spot, I found them in a spill over pond on the other side of the road. Any large puddles nearby are worth checking in and all around. I'd take a high powered flash light and check under everything they could hide under, spots near the others first. Lots of prayers for Valentine, Blue and you. Please keep us updated. Maybe you could also take your phone and play Calls to see if this triggers any movement or rasps. Also, move your light slowly because you'll probably need to look for eyes instead of the boys. Once the light hits them, they will hopefully look your way and their eyes will shine.