Should I enter my known acquisition date and cost basis in TurboTax's 1099-B line item boxes even though Vanguard's 1099-B leaves those boxes blank?
I have already entered long term even though Vanguard says the holding period is unknown to them (the date of my mother's death was Nov. 17, 2009 and Computershare transferred the stock to Vanguard in Dec, 2009 - it was in my acccount at Vanguard until I sold it in August, 2017.
