TomD8, box 11 should have nothing in it. Box 11 would only report amounts not received if they were prior-year deferrals that vested in the current year, making them subject to inclusion in Boxes 3 and 5 of the current-year's W-2. Otherwise an amount in box 11 represents an amount deferred and vested in a previous year that was paid out in the current year. In other words, box 11 is only for reporting amounts that were deferred in a previous year but vested in the current year or amounts that vested in a previous year and were paid out in the current year.
In this case the bonus was apparently an annual bonus earned in the current year, 2020, so it doesn't get included in box 11 whether paid out or deferred. See Example 1 of the Nonqualified Deferred Compensation Reporting Example Chart in the instructions for Forms W2 and W-3.
