Honestly, the reason I started looking in 2017 instead of 2013 is for a number of reasons.
Like I said originally, life got crazy/busy. My husband and I divorced, I was working on a degree, got remarried, had a kid.... just lots of things going on. I did not think about Bitcoin again until years later.
Try to look again on AOL, if you still have access, and look for Achive folder, the very old mails may be there.
Of course, you can also ask their support without mentioning Bitcoin, but if they get too curious and your info is not encrypted / password-protected they may help themselves...
Google about recovering old AOL mails.
Also one copy of those mails could be locally, but I don't know if, how and by what rules. Maybe it would not hurt to make a clone all those old computers' HDDs and keep one set of copies untouched, or at least not use for a while those HDDs. And of course, start digging for whatever could be useful - maybe wallet.dat files, maybe zip or rar files in case you archived them, pool info (slush?) and of course old mails saved in whatever form.
PS. If you talk about thousands of Bitcoin, I an surprised that you ignored them in 2014 and 2017...
This is clear if I'm not mistaken I have read this thread in another section where bitcoins have also been lost, but it's different from this OP. because he still keeps it in his computer's email address which may hopefully be opened in a file that might be able to be returned again. although it might also not be easy because it's been too long and there are so many changes besides, actually registering another email address to fix the password. maybe you can ask for a change in the password which you might forget, but if the repair email address is also forgotten, you have no other way to check maybe there are files left on the computer.
I agree with you that why is the OP just making a fuss now, why when there was an increase in 2013 it was not surprising, or it could be because it wasn't big yet and it was not surprising. but before the 2017 increase, hackers were already hacking into many companies and asking for payment using bitcoin, whether you don't know either. why did it take so long to wake up and was surprised. I hope it works