If there is nothing in any of the four box 12s (12a, 12b, 12c, and 12d), then don't enter anything when you enter your W-2.
PS, this phrase "see instructions for box 12" is for your employer, not you. You just enter what's there, if anything.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
