Are there any confirmed or unconfirmed letters/communications from Zodiac in February 1970?

None that I know of..there was a call on January 2, 1970

‘This is Zodiac. I just killed (inaudible)’. The call occurred at 1:59 pm at the FBI’s Sacramento office switchboard. The voice on the line trailed off at the end of the statement. This was similar to the LB call where the caller says he killed someone and then his voice diminishes at the end of his statement. The operator who took the call said that after the word "killed", the caller’s "voice began to soften until it faded away entirely. Then he hung up."

and later the my-name-is letter on April 20, 1970. Nothing inbetween as far as I know.

QT