Try contacting Atlassian Support, but they are not contractually enforced to assist you in this kind of request.
If you cannot recover the lost issue from the daily backup, the issue has been lost forever.
If you think (as well as I do) that JIRA should count with any way for recovering issues deleted accidentally, please, vote for and comment on these feature requests:
Effectively NO. Do not delete issues. I suggest closing with a resolution value of Deleted and anything you want to delete. I implement it with a special transition only the project lead can execute and it requires the fill in a reason field. When you delete it is GONE. Hardly a week goes by without someone wanting to restore an issue. Missing issue numbers will eventually cause a question about what it was and why was it deleted even if it was done properly. Missing data always brings in the question of people hiding data that may have looked bad.
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