If you don't have a copy of the W-2 form, you can look up the market value of the stock around the time it was acquired. That can be as easy as doing a search for the company online where you may find a link to historic stock prices. Here is an article from Investopedia that may be helpful on finding historical stock prices. The market value of the stock would likely be what was reported on the W-2 as wage income when it was issued, and that would be the cost basis.
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