Firebugs - Earliest Boost Pickups

Archipelago 1: 1, 3
Archipelago 2: 1, 3
Droid Gardens 1: 1, 1 (!)
Droid Gardens 2: 1, 3
Terrain Dunes 1: 1, 4
Terrain Dunes 2: 1, 3 (!)
Sky Port 1: 1, 4 (!)
Sky Port 2: 1, 3
Aerial City 1: (Don't know yet, probably 1, 3)
Aerial City 2: (Don't know yet, probably 1, 3)

If it has an ! next to it, it means the Boost Pickup is in an unusual/unexpected spot