Probably, it's part of this:
I also have older posts: I've saved (most) unedited posts (6.2 million posts) since September 12, 2018, until the start of this topic. This data has not been added to this topic, and I can't really add it because I tried to remove quotes and that has some bugs. You can request to dig up unedited data when needed.
But that's currently stored in large compressed files. Can you tell me what exactly you're looking for? I can probably dig up all posts made in that topic (without quotes and the above mentioned bugs), but it might be easier if you tell me what you're looking for.