You can wet them, shine a flashlight, put them under the sun for transition lenses, etc...
Not foolproof, but it would make it harder to substitute the lower end lenses, 3 coatings vs 2 coating would likely be noticeable.
8 coatings vs 7 coatings might not be.
So for the mid range and above it probably doesn't make sense to discount shop at all. Your entirely trusting the brand reputation or shop reputation on whether they will deliver.