If someone authenticates a brass core, then it's sealed, no one else can verify the authenticity.

Considering the latest events, I'd want my chip, open and free, so it could be examined and checked, if there was any doubt in the future.

The only entity that benefits from slabbing anything, is the company profiting from putting it in the case.

Keep watching what has happened with coins and see that it's a terible mess. Slabs are a false sense of security.