Who knows? I doubt any adcom today goes to the trouble of searching all their records for contacts as they review an app, but it wouldn’t be hard to automate it and have the electronic “folder” contain links to all contacts. Furthermore with the rise of AI it is entirely possible that by the time you are applying 3 years hence that some machine learning program will do it.
I don’t say this to scare you, but on the other hand I’d suggest not emailing colleges with questions they answer on their website.
Edit: I’m going to change my answer. It’s likely colleges already do this. I spent a few minutes browsing the websites of software for colleges
So you send in an email, they dump it into an account with your name and/or email (bits are pretty cheap), years later you apply and voila there all your past contacts show up.