You're confusing "State A" with "Country B" that was also mentioned in the Hoffmaster, et al., paper on the CDC website.
Country B is Chile, I think; the particulars all match what we've read about the Chilean anthrax claim.
State A, on the other hand, would seem to refer to one of the 50 states in the U.S., some state "not in the vicinity of the 2001 outbreak." The particulars mentioned for the State A letter do not match any letter I've read about.
There was the letter to the Microsoft office in Reno, Nevada, mailed from Malaysia, but this was reported to be a false positive.
I don't think the "State A" letter matches anything we've read about in the news (unless one of the supposed "false positives" was actually the real thing).