To your question, they can never be as good as they wish to be, and the open boarders have already let in the wolf.
Now it’s just a question of when and exactly where.
They have done pretty good work to have foiled the ones listed with details. I suspect it's just the tip of the iceberg of what's out there.
One in my state isn't on there, buying up lots of guns by a family or individuals who aroused the suspicion of the gun store owner. Can't remember where they were shipping them to.
Found it, just this past May.
Cedar Rapids family accused of smuggling guns to Lebanon - Des Moines Register