How do I figure the cost basis for RSU on 1099-B with tax withheld on W-2?

Taxpayer has a 1099-B that shows the sales price but no cost basis. 

His W-2 shows YTD earnings include RSU exercise amount

For YTD Deductions the W-2 shows the same amount as a deduction called 'Offset RSU Exercise' and also shows a deduction called 'RSU Tax Estimate' listed as a negative number.

There's one more piece of info I dug up from the tax payer's clearing house. It shows the original grant dates of the options from 2009 and their original prices (valuing about half of what they sold at in 2013)

From what I understand, the taxpayer shouldn't have a taxable gain because the tax was withheld from the W-2. Can anyone walk me through how to report this?

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