For the three transactions reported separately, under the section "Other Transactions - cost basis not reported to IRS - Form 8949", you should have a cost basis and proceeds posted to your return.
You got this message because prior to 2013 the broker did not keep track of the original cost. It was your responsibility to maintain it. If the documented cost value looks correct you can proceed.
If you're unsure you may be able to use Historical Stock Quote Prices - MarketWatch to determine the original value.
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