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If your broker doesn't provide certain information is is your responsibility to maintain it.  The items in question are:

• 1b (date acquired),
• 1e (cost basis) and
• Box 2. (Long/Short Term Gain)

Entry 1b will determine if it is a long or short term transaction.  If it is less than a year it is short term.  If it is more than a year it is Long term.  To the best of your recollection determine the date you acquired the investment.

Entry 1e is the cost basis.  This is the amount you paid for the investment.  You may be able to use Historical Stock Quote Prices - MarketWatch to determine the original value.

Entry Box 2  Once you know line 1b you will know if it is Long or Short term.  Check the appropriate box.

There are seven possible "Box" designations that indicate the holding period (Long/Short Term) and the reporting status.   You will use B or D depending on the long or short term condition.

Code A. This code indicates a short-term transaction for which the cost or other basis is being reported to the IRS. Use this code to report a transaction that the recipient will report on Schedule D (Form 1040), line 1a, or on Form 8949 with box A checked with totals being carried to Schedule D (Form 1040), line 1b.

Code B. This code indicates a short-term transaction for which the cost or other basis is not being reported to the IRS. Use this code to report a transaction that the recipient will report on Form 8949 with box B checked with totals being carried to Schedule D (Form 1040), line 2.

Code D. This code indicates a long-term transaction for which the cost or other basis is being reported to the IRS. Use this code to report a transaction that the recipient will report on Schedule D (Form 1040), line 8a, or on Form 8949 with box D checked with totals being carried to Schedule D (Form 1040), line 8b.

Code E. This code indicates a long-term transaction for which the cost or other basis is not being reported to the IRS. Use this code to report a transaction that the recipient will report on Form 8949 with box E checked, with totals being carried to Schedule D (Form 1040), line 9.

Code X. Use this code to report a transaction if you cannot determine whether the recipient should check box B or box E on Form 8949 because the holding period is unknown.