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A 1099-B with Box E checked simply means that the amount shown as cost basis, if any, was not reported to the Internal Revenue Service.
Your transaction(s) may have an amount showing as cost basis but that does not mean it was reported directly. What was reported to the IRS was the sales proceeds only for those transactions.
The following is an excerpt from the IRS instructions for Form 8949:
The actual cost basis may differ from what shows on the form you received, such as in the case of reinvested dividends, if any, and other amounts that may increase or decrease the basis as shown. If you can determine the actual cost basis as you have it then enter that amount as the cost basis in the entry.
