Short version: TSA confiscates some pipes (not the smoking kind) even though they were determined not to be a threat. Forgets about them. Next shift sees them and goes WTF? and calls the bomb squad. But no evacuation ensues.
Several law enforcement sources told CNN the objects were determined to be homeopathic medical devices.
If it was a homeopathic bomb, then it would have beed diluted of all explosive materials, making it (homeopathically) the most dangerous explosive device EVAR!