This date showed up in the beginning of discovering the ARG too, it actually was in the 1970 log for me the first time if I remember correctly, there’s some weirdness going on there since it’s at midnight and sometimes displayed as 31 dec 1969. I think I may have archived this in my original post from the first day when cataloguing the entries. Lemme go have a look
edit:
I had to take a picture with phone because desktop screenshot wouldn’t capture it showing the link url down bottom right on hover, to show its from the 1970 entry log.
this is from an early post from first day found here