"Is it acceptable to add the non-covered ..."
Yes.
For non-covered securities ( BOX B or E) showing zero (or wrong) basis, enter the correct basis yourself.
Use code "B" and put -0- in col (g).
The correct basis on the sale is the amount you mentioned.
OR you could report non-covered and covered in separate transactions with the same Date Sold.
Either way is OK.
Date Acquired can be "Various".
@Jonathan1
