I think I answered but still don't lock the thread, maybe someone e.g. "LoyceV" will give you more info.
If it's not in
my post archive, I don't have it. You may be able to find more on sites like archive.org.
I started downloading old posts
2 years ago, and completed it in the months after that. Later on, I shared this data with TryNinja (who has a much cooler searchable database). Any posts that didn't exist anymore at that moment (obviously) couldn't be scraped.