Prior to 2013 brokers did not have to keep track of basis; Therefor it became your responsibility to record it. This may help you get some idea of earlier values,
MarketWatch Stock History
To correct the cost basis on stocks from a 1099-B
- Start at Investment income
- Select Stocks, Mutual Funds ....
- Choose the Broker or Institution
- Select the individual stock
- The data you entered will be there
- Toward the bottom of the screen select [I'll enter additional info on my own]
- In the entry for Box 2 enter Corrected Cost Basis
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