How to know which theme purchases already are in use/ have registration tokens

Envato Customers Purchases and Subscriptions
1

I have 5 same themes purchased. That theme needs token for registration/ activation. Have 4 active use and 1 not. How to know which theme purchase already have token/ which one/ and is it in use or just empty? Anyone else had same problem? Any advice?

2

contact theme Author and let them know How to Contact your purchased theme Author, theme author will be happy to assist you.

Thanks