once holding period for the shares is determined (Box B or E), you can enter "various" for date acquired within that holding period.
IRS says:
"For non-covered securities ( BOX B or E) showing zero (wrong) basis, enter the correct basis yourself.
Use code "B" and put -0- in col (g)."
TurboTax will do this if you tell it to with "I have a basis issue"
.@cher52