Worthless is a way to explain why you have a proceeds of zero.
If the detail is on your broker 1099-B, no other documentation should be attached.
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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).
For Box A or D, leave basis as reported, use Code "B" and put an adjustment in col(g).
If the basis is not reported to IRS, there's nothing to adjust.
