Copyright notice in Envato elements file

I have a folder of stock templates, videos, and sound files. How do I find out which of these test files is owned by Envato and my current subscription so I can use them? Is Envato written into the files somewhere? If so where?

Without know the answer, I must delete them all and start over in a more organized way–Too much work.

Thank you!

All must be in your dashboard, where you can search appropriate files.

I have searched for content across several different stock services. So, just checking Envato does not work. Thanks though