^ state charges being ultimately not filed in favor of federal charges are one reason that they'd "disappear" from all the state court reporting. (Some states have electronic court record access) this usually means that while arrested and held, he was not charged.
They would show up as dismissed otherwise. But not if they were never technically filed in the first place. Then the state prosecutor can *still* file them within the statute of limitations if fed dismisses them. So they don't give a fuck.