I redeemed $1500 from a mutual fund with a $40000 balance. The fund sent a 1099-B form listing # of shares sold, date of transaction and proceeds, and stated basis not reported to IRS. How do I report the date the redeemed shares were purchased and their cost basis on a fund I have held for 30 years? I stopped investing in the early 1990's and have accumulated roll-over dividends since.