Hi, thanks for purchasing my audio assets!
Don't worry, yes, that was legit (if I am not wrong it was a bundle in collaboration with GameDevMarket, where I also sell assets).
Sorry that the license text wasn't in the zip, I must have forgotten to add it to that bundle. But your proof of purchase from Fanatical is more than enough, you don't need anything else, songs are not registered for Content ID or anything like that.
The license document only states this:
"Audio assets included in the package may be used without attribution in commercial and non-commercial projects of any kind.
The audio assets may not be redistributed or remixed in whole or in part. They may not be resold elsewhere as an asset or part of an asset pack, unless explicitly approved by the author.
If you want to attribute the audio assets (which is greatly appreciated), please clearly include the names 'Andrea Baroni', 'bluegestalt' or 'Cyberleaf Studio'."