Box 12 V is just telling you the amount that was added to your wages (when the stock vested) and is included in your Box 1 Wages.
Take the amount in Box 12, divide by number of shares received, to arrive at your Cost Basis per share.
You can then enter your 1099-B as a regular stock sale (don't indicate employee stock) and enter the correct Cost Basis. Check the box that says 'my cost basis is missing or incorrect' and enter the Cost Basis. If your 1099-B shows a $0 Cost Basis, add the amount per share you calculated, times number of shares sold on the 1099-B.
If your 1099-B has a Cost Basis amount, add the amount you calculated to that amount (for number of shares being sold).
You should end up with a small gain or loss, or may break even, depending on how long you had the stock between exercise/sale.
Here's more detailed info on Non-Qualified Stock Options.
@lenfennell
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