This indicates the issuer of the 1099-B does not know the date you acquired the investment (Box 1d) or the amount you paid for it (Box 1e). You can always use the 'V' for various in the date acquired, however you must know if the holding period (one year or less = short term/more than one year = long term).
Likewise, the cost must be known and tracked by you. Financial agents will know the cost if the investment has always been with their company, however if it was transferred into a company, they would not know what your original costs were.
If you have your historical data (original purchase, dividend reinvestments, stock splits, etc) you will be able to find your cost. There are also websites that may have historical data depending on the type of investment you have. If you do not know your cost, you can find the cost on the date(s) you acquired the investment.
@spillchris
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