I haven't used AOL for years and wish to delete all these 2997 old emails. Can I do it at one time?
How to delete all AOL emails at once?
At first, sign into your AOL email account. Press and hold the 'Ctrl' key for a moment, and select all the emails you want to delete the unnecessary emails. If you want to remove repeated emails, press the 'Shift' key and hold for some time, and then hit on the first email you want to remove.
How to Delete Multiple Messages in AOL Mail Permanently ...
contactforservice.blogspot.com/2016/06/delete-multiple-messages-in-aol.html
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This is from doing a Bing search