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I unfortunately can't find an authoritative source, either, but I recall a /r/SpaceX discussion where it was stated that hurricane prep includes maintaining power because they're (lightly) pressurized at all times.

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I wonder if they might maintain pressurization to increase strength in the event of some mishap, but it's not an instantaneous disaster if pressurization is lost.

I recall reading that they have equipment to maintain pressurization while the boosters are trucked to the launch site as well, so it's not just flight loads, in any case.

Yeah, they aren't balloon tanks (which absolutely require pressurization), but they do keep them pressurized as it improves their structural stability.

They're pressurized with nitrogen generally, just to keep them clean and dry inside. They're quite capable of standing or lying down while unpressurized though.

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