Where are the Joker Balloons in Amusement Row?

Question

I've been up and down Amusement Row in Batman: Arkham City and I have only found 3 or so Joker Balloons. Do I need to progress further in the story for them to spawn or are they just waiting inside a building?

I'm tracing the Joker's radio signal to the steel mill.

Answer

I've confirmed that more will spawn later in the game.

Specifically, more spawned after I emerged from the ruins of Old Gotham after the encounter with Rāʾs al Ghūl.

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