regarding 1099-B for the deceased......my brokerage co does not know the cost basis and I have no records except that I see dividends have been paid for many years even going back to an old 2008 1040 tax return that I found...brokerage only knows when the acct was created, no prior history.....should I use the acct creation value for cost basis....(might go back to 1994) or any suggestions...
