I am struggling with form 8949. I sold old stock (purchase 1978-2010). Long term transactions with no cost basis. I used an average, annual stock price chart downloaded from MacroTrend. I averaged the highest and lowest annual average cost, and used this as the cost basis for the sale; then entered that amount times the number of shares sold, summaries for each. What in the world am I to attach to form 8949?
