It's been gone over. ANY case that never actually came to fruition in a terrorist attack (IE virtually every success as opposed to failure) you'd label as a 'bogus case'.
Once the FBI or anyone else gets wind of a potential terror threat, they are NOT going to let it proceed with the suspects getting their hands on anything that's actually dangerous. Then if it got out of hand innocents would be killed and the LEA that knew about it could be partially responsible. They're virtually *ALWAYS* going to have to use informants, and then entrap people using controlled materials, not actual bombs or stinger missiles or whatever the plots involved.
I've pointed it out before- even as the usual dimwits whine things like "Why didn't the FBI concentrate on REAL threats like the Boston Bombers, but instead they were on thus and such case..." the REALITY is, before the fact, the Boston Bombers and most other would-be mass-murderers are just another bunch of 'poor people' and any attempt to step in and *gasp* entrap them BEFORE they were able to pull off their plot, would appear to you as "just trapping a couple of poor kids for no reason!" and you fuck well know it.
In other words, no one has a crystal ball for these things, and no legit LEA once they have a suspect that informants are telling them is plotting something, is going to ever let them actually CARRY IT OUT, just so you can know whether it was the real thing vs. 'just trapping some poor people.' Because while hindsight being 20/20 is great for armchair detectives and bleeding hearts, it means shit in the real world, in real time, where no one knows the difference and can't know until something horrible actually happened.
Does this mean every one of these cases would have resulted in some horrible mass murder on its own? No. The point is... NO ONE can fucking know for sure, and letting a mass murder actually happen is NOT an option. It's a shit sandwich either way, but being willfully stupid, paranoid and conspiratorial about it is fucking stupid.