EPD is a publicly traded partnership. as such the sales should have been reported in the section of the 1099-B where the cost basis is not reported to the IRS. EPD should have provided a sales schedule that allows you to compute the long and short-term capital gains. this is what's important.
you can adjust the cost on one S-T sale so that the cost for all S-T sales are correct. the same for one long-term sale so that the cost for all L-T is correct. the IRS won't raise any issues because the broker does not furnish the IRS with the cost basis
