
The author of the 2001 card decided not to mimic any previous confirmed Zodiac communications (envelopes) that were publicly available to them, and opted to use the full newspaper address of "San Francisco Chronicle", never done previously in any Zodiac Killer communication widely accepted as genuine by the Zodiac community. However, it was done by the 1990 Eureka card author eleven years previously. The author of the 2001 card chose to use "901 Mission Street" on the envelope, never done previously by the Zodiac Killer. However, it was done by the 1990 Eureka card author. The author of the 2001 card chose to use the zip code of "94103" on the envelope, never done previously by the Zodiac Killer. However, it was done by the 1990 Eureka card author.

However, the letter mailed on May 6th 1986, four years before the 1990 Eureka card (and not publicly released), also began by using "Editor" on the first line of the envelope, followed by the full address of "San Francisco Chronicle". In fact, the 1986 envelope began with "To the Editor", similar in fashion to the 2001 Happy New Year card that began with "Letters To The Editor". The 1986 letter can be connected to the 1987 letter, which can be connected to the July 31st 1969 letter to the Vallejo Times-Herald. The 1986, 1990 and 2007 mailings are the only communications publicly available now, all consecutive to one another, that all begin by using "Editor" on the first line of the address, followed by the full newspaper title of "San Francisco Chronicle".
The question we have to ask is this: Did two independent and separate hoaxers just happen to mimic each other in 1990 and 2007, but neither made any reasonable effort to imitate the previous communications of the Zodiac Killer? Was the author of the 1990 and 2007 communications the same hoaxer, who never made any reasonable effort to imitate the previous communications of the Zodiac Killer? Or was it the Zodiac Killer who authored both festive greetings cards, who placed no emphasis on attempting to imitate himself? A hoaxer of the Zodiac Killer, by his very nature, should want to imitate previous communications to convince the reader he is the real deal, but the actual Zodiac Killer has no such obligation because he is genuine article. In other words, a hoaxer of the Zodiac Killer communications, who fails to hoax properly, may not be a hoaxer.