I have been unable to get a firm answer on this. I
Post# of 72440
https://theintercept.com/2016/09/24/naked-sho...d-forever/
Once that CUSIP changes, the naked shorter has no apparent way to close out the naked short position. No stock under the old CUSIP number exists anymore; it all automatically converts to the new CUSIP.
Those trades can sit in the Obligation Warehouse forever, in theory. But the “aged fails” — essentially orphaned naked short transactions — remain on the naked shorter’s balance sheet as a liability to be paid later.
I am disappointed by this as I wanted to have this naked short business put to rest. Squeeze them if they're there under the water or dispel the myth if nothing happens. We'll see what the volume shows.