Comparing a new batch against an old one. A changed taste or smell is different in a way that may be nothing.

Holograms are the least useful check because they are the one everybody makes.

The same imprint exists in several markets for different products, so country matters more than the database.

Pellets inside a capsule are normal for enteric formulations and are not a sign of anything.

Foil thickness and seal pattern are where counterfeit blisters fail.

Country is in the details, which I know matters.