Of course not. Reason being you didn't make any long distance phone calls with a 'calling card' you thought was 'untraceable' - WHICH McVeigh and Nichols did do ...
Uh, if true, that's tangible proof that McVeigh and Nichols were involved in the OKC bombing (which we all know)
But it doesn't tell us anything one way or the other regarding whether they had accomplices or who those accomplices were.