I encountered these questions recently and could not find any answer.
The scenario card for scenario 1 says under setup: "Set the Scientist and boss card off to the side. The first player to land on the Police Station draws the boss card"
-> There are 2 boss cards in the Zombie deck. Which of these boss cards do I set off to the side? What do I do with the other boss card?
I played the scenario with the fireman, who has the ladder in his deck, which says: "Discard: Avoid drawing a monster card".
-> Can I use the ladder also to avoid drawing a boss card? OR Do bosses count as monsters?
You shuffle the boss together and randomly draw one to use. The other gets put back in the box and is not used for the scenario.
I would say no, as it’s a boss and not a monster but as with any game you can play this as you’d like.