How to find back a license key?

[kact375]

I’m pretty sure I bought a Typhoon theme few years ago (maybe before Gumroad was chosen as system). Unfortunately, I do not find my license key anymore and I cannot figure out which email address or login was used. Is there any way for me to find back that key? Maybe giving to someone my full name (first name + last name) or other information from the actual or former billing/payment system). Of course, I would understand if it’s not possible, but I wanted to try. Regards, Michael