We want to sell a tax free muni fund (vmpax) which Dad bought about twenty years ago then died leaving no trade confirmation and no brokerage summaries. Fast forward to today, Mom wants to rebalance the portfolio. The interest was reinvested over the years and the historical share price has varied over the years from a low of $8.39 and a high of $9.26 with the recent closing at $8.99. The total position is $69,000.

My thought is that the interest is tax free or was taxed each year (this is a taxable account), the cap gains were taxed each year and the original share price was likely a bit higher than the last closing price so there should be no tax owed and maybe a small tax loss on the share price.

The big question is how do we fill out the Schedule D on this one?
TIA for your thoughts on this.