oh no, we had a few soay and ours used to pop the fences like a deer so we sold them, as i was sooo worried they would escape. if i saw something dead on the main road, i would feel ill incase it was my soay so i can imagine the feelings you are going through.
dont worry though, im sure they will find a flock to join up with.
when our goat escaped(i was searching farms and gardens too), she did come back herself. and when our 2 heifers went for a walk, they joined the neighbours herd, so there is hope!