I have access to some of my old computers, hopefully the right ones. To be honest it's a crap shoot, but, I gotta try. I do not know if the email folders were saved on my HD.... like I said, when I login to mail.aol.com, it shows only email from 2015 til current. I lost literally 15 years of emails/files/folders.
A couple of years ago, I tried logging on to aol via AOL Desktop program, and it is no longer working/functional. They discontinued it.
The only steps I took in 2017 to recover the info was just trying to log on to my old email accounts, and did quick scans looking for certain keywords, such as bitcoin, bitcoin core, bitcoin-qt, wallet, et. cetera.
why the emphasis on email? if you physically have the computers you believe the wallet files are on, you should be searching
those for your wallet.dat file.
are you sure we're talking about a local bitcoin wallet (on your PC) and not an account with a third party website?
I hope that the OP can receive the information you provided, if indeed it is a matter of a wallet that has indeed forgotten the computer and in fact, if there is still a computer, it can be traced properly. but it looks like the OP only emphasizes on the email address nothing has been done to find the wallet.dat file which may still be stored properly and not overwritten by another wallet.dat file or could catch a virus.
but it is also true whether this is only a matter of a wallet that is not on the computer or as your explanation is indeed related to a third party. if with a third party maybe there is no other way to fix it and be able to find out the email address.
We hope of course it can be resolved well and of course this is quite a lot of assets, but why does the OP only realize that this year is not 2013 or 2017 which may be relatively early.