Hi mwltatg,
Here is what IRS says:
"Keep records of the amount of the reinvested dividends, the number of additional shares purchased and the purchase dates. You'll need this information to establish your basis when you sell the shares."
https://www.irs.gov/faqs/capital-gains-losses-and-sale-of-home/stocks-options-splits-traders/stocks-...
Understand the difficulty compiling 30 years of data. Please see if the administrator/custodian of the Dividend Reinvestment Plan can provide the cost basis.
Hope this helps.
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