Ghostly Drone Not Showing Up in Ranch Expansions

You might hear from another player that they found a Ghostly Drone in a particular ranch expansion, or, because you found one in your first expansion, assumed there was one in each. 

There's actually only one Ghostly Drone that's shared across the first three Conservatory expansions. It wanders between these expansions, so you might not see it until you wait around for a while. It will wander between those three until you collect it.

The last two expansions, which are the furthest away, each have their own Ghostly Drone that does not leave that specific expansion.