From the very enlightening NPR interview with Ivins’ attorney, Paul Kemp:
“They have a Secret Service document examiner who examined the stamps on these pre-franked envelopes [envelopes with prepaid postage] that contained the anthrax in the anthrax attacks. And because of microscopic defects, you’re correct, he was able to tie those to lots or a set of envelopes that were mailed to three post offices that are listed in the search warrant affidavits, that are listed in all three search warrant affidavits: Elkton, Md., Cumberland, Md., and Fairfax, Va., the main post office in Fairfax, post offices that service the entire width of the state of Maryland and then the biggest post office in the state of Virginia.
Yesterday, Mr. Taylor says they came from a post office in Frederick, and that’s just, if that’s true, then maybe they misrepresented something to three different federal judges in obtaining these search warrants, or he just got it wrong, and I choose to believe it’s the latter.
And so there’s no connection to any post office that Ivins has ever had an account with and there’s no evidence he ever purchased these envelopes in the search warrants that they executed…”