@fanfare Sorry - I only just now refreshed my page and saw your earlier suggestion about what to mail in.
In my case, two pertinent pages from the relevant 1099-B is the clear answer.
I wonder why TurboTax doesn't import the Box "E" details into a Form 8949, the way that it does for Box "D" details. Unless the brokerage doesn't want to be responsible for these cost basis info, and so they force the filer to verify their info.
