I specifically referred to the witch kings surveillance artefacts with misreading. I don’t think their creation story is mentioned in LOTR, other than that they are extremely powerful and dangerous.
But you are right of course about Anduril and if you take the whole silmarillion as background. I never really liked that part though
The Palantiri were created by the Elves in Valinor and given to the high race of Men.
The witch-king could in theory have used a Palantir, but there’s no suggestion he did.
The seven stars in Gondor’s crest are the Palantari, and in the War of the Ring, Aragon specifically requested they be added to his banner. They represent the highest level of the civilization of Men.