They're fortunate in that either the Allied Seawind or Seabreeze, both seaworthy and well-built, will probably take care of them.
If you'd called the Coast Guard, they might have done a "precom" check by phone or radio to see if the boat had shown up in any of the usual harbors. But I wouldn't beat myself up if I were you. Was the weather fair? If so, they're probably all right.
Next time you're nearby, let us know they made it in okay. At least they picked a good, tough boat to be idiots in. Robin Lee Graham, a teenager, sailed one of these about halfway 'round the world after his 24' sloop was just too small and slow...