Cost basis for UGMA mutual fund
Folks,
I have completed all of our Federal tax filing complete except for one item - the cost basis for a UGMA mutual fund I sold last year. I was given the UGMA mutual fund as a child, and did nothing with it (other than paying taxes on short and long term gains on it once turning 18) each year until (a) converting it into my sole account in 2006 and then (b) cashing it all in in 2009. I have contacted the company of the mutual fund and they claim they don't have any records back past 1998. After speaking with the mutual fund company they said they would send my all of the records that they had (which from the discussion sound very incomplete); that was three weeks ago and I have not yet received it.
For reference I'm 47 and was given the gift from my grandfather back in the 1960s.
Do I file for an extension while waiting? The total value of the mutual fund wasn't huge (~$4000), but the cost basis will change the amount of taxes we owe. This is the one major tax obligation we have...
Any suggestions or help would be very appreciated. Thanks in advance.