I think they are all on (apart from threads from banned users or other threads pulled by the Editor). Occasionally someone posts a link on here to the first ever question
Maybe there are questions going back to 1964 but they got deleted due to the 'millennium bug' year 2000 problem.
I'm not convinced that Mona Lisa question was from 2000 (ed can fudge dates as there is a thread dated 2014) but some members on here have been around many years and may remember when it started
Open the link. And then go to the address bar and where it says Question1000 change the 1000 to whatever number you want. I think it fails though if you choose a number for which the question was deleted. The first 100 or so are all written by ATOB which I assume was an AB tester
"I'm not convinced that Mona Lisa question was from 2000 (ed can fudge dates as there is a thread dated 2014) but some members on here have been around many years and may remember when it started"
Why aren't you sure? We were founded in 2000. It is the first question :)
Factor 30 has drawn our attention to ATOB2 who joined AB on Friday Ist December 2000 and he/she's last activity was on the same day; having asked (according to Profile) 155 questions and given 59 answers, all at the same time, without even a badge.