There is no tax return to amend unless investors write down their shares without having their brokers remove them from their accounts as worthless.
If an investor requests the broker do that, then they will report the capital loss to the IRS for that investor.
If the investor does not have the broker remove the shares as being deemed worthless, there will be no such reporting to the IRS.
Therefore, the investor would be forced to amend his/her return to reflect what was reported, or not reported, to the IRS.
Market makers who have placed IOU's or electronic markers in retail accounts that are the result of naked short sales by the market maker, are able to close out the open naked short orders in the retail accounts as a result of write downs for worthless shares, which are removed from retail investor accounts.
$3449/1M shares invested is hardly a reason to write something down as worthless!
Good Luck!
Please research all stocks before investing. My posts are my opinions and are not buy or sell recommendations. Always force abusive short sellers to cover above what you paid. Build wealth for fellow iHub'ers!