The OKC bombing was a known false flag operation. Unexploded ordnance was remnant after the attack, which Nichols could not have place in the building, as he never entered the building.
He used a fertilizer bomb in a vehicle. Bombs in the building, one of which didn't blow, and was found subsequently, could not have come from him.
FBI did it, just like they did the first WTC bombing. Few know that it was acknowledged in open court that the FBI admitted to supplying the explosive, training, and plans for the first WTC attack.
It's a matter of public record.
Thanks!