Unless you are using a non-English keyboard they are to the right of the 'P' key - [ and ] unshifted, and { and } shifted. This is the case even on my Windows keyboard, and folding keyboard for Palm.
They should be accessible this way:
Open Square bracket = alt + (
Close Square bracket = alt + )
You can also use the Keyboard Viewer to find out where the keys are.
The software doesn't allow the use of these characters 😟
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[] keys - where?
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