traditionnal way

scala> if (from1.isDefined) from1 else
     | if (from2.isDefined) from2 else
     | if (from3.isDefined) from3 else
     | Some("Default Value")
res5: Option[String] = Some(found)

scala> from1 match {
     | case x if x.isDefined => x
     | case _ => 
     |   from2 match {
     |     case x if x.isDefined => x
     |     case _ =>
     |       from3 match {
     |         case x if x.isDefined => x
     |         case _ => Some("Default Value")
     |       }
     |   }
     | }
res6: Option[String] = Some(found)

scala>