Cross-posting tends to upset AB's moderators, so it's not unusual for a duplicated thread to disappear.
Whenever I remove duplicates, I try to zap the thread(s) where there are no answers yet. However I've come close to deleting a 'populated' thread by mistake in the past, so there's always such a risk when cross-posting.
(And, no, it wasn't me this time. I didn't even see any of those threads).
Unfortunately, Ummmm's wish for the deleted thread won't come about because there's no way that deleted threads can be retrieved.