I can't think of any scenario where using modulus to prevent a verse or chapter number from going out of range would give a a helpful result. Worse yet, at 999 (the purported max), we actually seem to have an unintentional off-by-one error, and 999 gets treated as 0. I would argue that if a verse or chapter number has been set to a value > 999, it should just be clamped to 999, in much the same way we are dealing with negative values.
It could possibly be argued that out-of-range values should throw an exception, or at least that a flag could be passed indicating whether the caller wants to clamp or throw.