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Yes, the /bin/sh in HP-UX 11 is a kind of ksh88.
(Strange: the /bin/sh binary is bigger than the /bin/ksh binary.)

The header states it is HP-UX 11.31. In HP-UX 11.x the Bourne /bin/sh has been replaced by a Posix shell.
And this /bin/sh does know the [[ ]]. Also the ksh-88 knows it.
(While an old Bourne shell...

I looked in my crystal ball and did not see anything either.
Perhaps you can post the file? Please in [code] tags.