You can’t get in touch with the artists. And probably yes, you will need an enhanced license to put it on your products, but it’s difficult to appreciate, because you may be good enough with a standard license:
Cannot use asset prominently in merchandise or products for resale |
The keyword is ”prominently”! So if the asset is an important part of your packaging concept, yes, you need an extended license. It’s probably an extended license if I understand your use correctly.
But in both cases, you are allowed to use the asset as your own, except that you cannot sell the asset to others an you are slightly limited in what is allowed (ie run of less than 500,000 for a standard license) before you need a different license.
As the asset will not be used as the logo which is an exclusion factor you can go ahead.