Hmm. I've compared both models. I honestly don't see any real issue here. The labels don't look identical, and they are both very similar to many generic coffee cup label templates that are out there by the dozen for photoshop. Looking at the geometry, I don't really see any identical vertices outside of the standard cylinder that is common in most 3d modeling packages for creating the base shape of any cup model. I really can't say he stole anything here, my friend.
I haven't looked at any of his other models, but I don't see anything to worry about regarding this particular product.