
If the Zodiac Killer was the abductor and murderer of Donna Lass from the Sahara Tahoe Hotel on September 6th 1970, then one might have expected him to claim or insinuate her murder in his next communication, the 13-Hole postcard. Despite later suggesting his involvement in her murder on March 22nd 1971 when the Pines card was mailed, he never increased his victim count from the July 26th 1970 "Little List" letter to the 13-Hole postcard on October 5th 1970, which spanned her abduction. Or did he increase the victim count and we simply didn't recognise it? The Pines postcard and 13-Hole postcard both contained punch-holes (suggestive of victims), both contained pasted text, and both carried inverted wording within the postcard. The inverted phrase of "around in the snow" on March 22nd 1971 was clearly referring to the murder and burial location of Donna Lass, so where was the reference to Donna Lass in the inverted text on October 5th 1970?
The construction of the October 5th 1970 postcard may have began just over two weeks after the disappearance of Donna Lass, because all the newspaper cuttings identified on the postcard were sourced from the Oakland Tribune, San Francisco Chronicle and San Francisco Examiner (all separated by only 9 miles) The cuttings were taken from publications dated September 23rd and 25th.
The construction of the October 5th 1970 postcard may have began just over two weeks after the disappearance of Donna Lass, because all the newspaper cuttings identified on the postcard were sourced from the Oakland Tribune, San Francisco Chronicle and San Francisco Examiner (all separated by only 9 miles) The cuttings were taken from publications dated September 23rd and 25th.

On the day the 13-Hole postcard was mailed, a newspaper article by The Orlando Sentinel carried the headline "Zodiac, Killer Of 5 or 13, Silent As Police Wait". The 13-Hole postcard carried a cutting of the number 13 and used the word "police" in the inverted text - so was this section of text giving us a clue to the total victims killed, which now included Donna Lass? The text read "There are reports city police pig cops are closeing in on me. Fk I'm crackproof. What is the price tag now?" Could this have been cryptic in nature, just like the Pines card mailed 5 1/2 months later, telling us surreptitiously that he was the murderer of Donna Lass and reading "There are reports city police pig cops are closeing in on me. Fourteen killed I'm crackproof. What is the price tag now?" In other words, responding to The Orlando Sentinel headline of "Zodiac, Killer Of 5 or 13" on October 5th 1970 (or earlier newspaper that carried the same or similar question).
It would mean that the main body of the postcard was reiterating the victim count from the Little List letter on July 26th 1970, but teasing us with the cryptic clue of "Fk" to suggest that there were now "Fourteen killied" in total. This may have been repeated when the Halloween card arrived 22 days later, on October 27th 1970, when he added 13 "floating eyes" to the card, but added the number "14" on the hand of the first skeleton, placed "4-TEEN" atop of the second skeleton, and used the letter "F" once again in the strange symbol at the foot of the card (and on the envelope). The "F" in "Fk" on the 13-Hole postcard may have denoted the number fourteen. The "F" in the strange symbol on the Halloween card may have also denoted fourteen, by combining "Z" and "F" to give us "Zodiac Fourteen". The four dots giving us a clue that "F" meant fourteen. This would mean that the Zodiac Killer gave us two cryptic clues containing the letter "F" in a span of 22 days. The Zodiac Killer could also have added the 14th punch-hole of his career to the Pines postcard, to make up for the one he deliberately withheld from the 13-Hole postcard on October 5th 1970. A postcard in which he decided to use "Fk" instead. But did the Zodiac Killer specifically invert his text in two postcards to represent one victim? That of Donna Lass.
It would mean that the main body of the postcard was reiterating the victim count from the Little List letter on July 26th 1970, but teasing us with the cryptic clue of "Fk" to suggest that there were now "Fourteen killied" in total. This may have been repeated when the Halloween card arrived 22 days later, on October 27th 1970, when he added 13 "floating eyes" to the card, but added the number "14" on the hand of the first skeleton, placed "4-TEEN" atop of the second skeleton, and used the letter "F" once again in the strange symbol at the foot of the card (and on the envelope). The "F" in "Fk" on the 13-Hole postcard may have denoted the number fourteen. The "F" in the strange symbol on the Halloween card may have also denoted fourteen, by combining "Z" and "F" to give us "Zodiac Fourteen". The four dots giving us a clue that "F" meant fourteen. This would mean that the Zodiac Killer gave us two cryptic clues containing the letter "F" in a span of 22 days. The Zodiac Killer could also have added the 14th punch-hole of his career to the Pines postcard, to make up for the one he deliberately withheld from the 13-Hole postcard on October 5th 1970. A postcard in which he decided to use "Fk" instead. But did the Zodiac Killer specifically invert his text in two postcards to represent one victim? That of Donna Lass.