Box 5 would be the exercise price paid per share. Multiply that times the number of shares you sold in the current year and add the discount reported on your W-2 and that will be the cost basis for the non-RSU stock you sold. The discount on the RSU stock would be listed on the W-2 in the year they were exercised. The cost basis of those shares will be the discount divided by the number of shares acquired. Multiply that by the number of shares sold to get the cost basis for them.
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