Go figure.
My recollection of the bomb prosecution is as follows:
Carol Howe, working for the Government, reported that there was bomb making going on at E-City and smuggled out a sample to give her story credibility. Her boyfriend apparently helped her. After the OKC bombing, Ms. Howe started to talk openly about her written reports describing E-City plans to blow up the OKC Fed Building. These reports were submitted prior to the bombing itself and would show government foreknowledge of a plot. The Feds really reacted to this. They prosecuted her and her boyfriend for posession of the same bombmaking materials that she had previously provided to the Government. I think the boyfriend was convicted but Howe was acquited.
If you want to dig into OKC I recommend reading everything you can about Carol Howe and the German Andreas Strassmeir. Ambrose Evans Pritchard nailed Strassmeir on his OKC envolvement. I believe he was a government agent working at E-City and was wisked out of the country within days of the bombing. A dead ringer for John Doe #2. Carol Howe has stated, I believe, that he discussed the bombing with her prior the event.