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

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?

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