You have to report the sale on your tax return. Lacking any cost basis, the
IRS will consider the entire sale amount as taxable. So, you need to make your
best effort to determine the original cost basis, even if (worst case) it's a
guess. Historical prices of publicly traded stocks are readily available on the internet and should,
at least, satisfy the IRS that your basis wasn't zero; just "google" “Historical
Stock Prices". I use http://bigcharts.marketwatch.com/historical/
