Hopefully this is the Actor ID you need. The 2 bosses I noticed where the bot doesn't go back to town after killing are the Dark Angel and the Winged Molusk. I wasn't paying attention to get the Winged Molusk ID.
[TabUI] Unit ActorSNO: 354050 Name: X1_LR_Boss_Dark_Angel-123459
[TabUI] Unit ActorSNO: 354050 Name= X1_LR_Boss_Dark_Angel-62765
[TabUI] Unit ActorSNO: 354050 Name: X1_LR_Boss_Dark_Angel-123459
[TabUI] Unit ActorSNO: 354050 Name= X1_LR_Boss_Dark_Angel-62765