For the handwriting aficianados, the capital letter G present in both the 408 and 340 ciphers is noticeable in both the Albany letter and Skin letter, as is the threat of a "next time" and a "next victim". The Albany letter threatens to "start killing again", with the Skin letter threatening "I must kill more". However, all this is incidental when we consider the boxy style of both ciphers and the ciphertext characters the Zodiac Killer chose. Never before had the Zodiac Killer chosen the sun cross symbol, yet it featured in both the Albany letter cipher and the Skin letter cipher. I won't list all the correlations, because it's far easier to show the overlapping features contained in both unpublished ciphers.
"T(h)is (is) the Zodiac Speacking. Why can't you stop me. I can't stop killing. Stop listening t(o) phonys. If this is not on the front page in a week I will skin 3 little kids and make a suit from the skin".