I think there's a misunderstanding in answering the question of bbbb
I'd mean a fysical view of the opening or closingcredits.

I also prefer a check from the disc credits but thats not always possible. Who has so much features in his collection.
I sometimes search on internet for the credits and refer to the link of it because I don't know how to make a screenshot. If I knew I would posted it.

So what I said about only a  visual check without fysical proof is not correct.

I hope you understand me and thanks for completing this thread.

John