I'm completely new here, so hi and thank you all in advance.

So to keep things short, I have a stupid amount of gmail accounts, and have a bad habit of creating new ones.
I've bought several Cydia apps through this account, but cannot for the life of me remember which gmail account it's linked to.
Any way to find out?
I've been through several of my most-used accounts, and found e-mails from paypal of my purchase, but it doesn't say which account its been purchased from.