It's almost impossible to do that.
In order to have information about the new location of the posts, TryNinja has to scrap the location of all the posts made in the forum again and again forever.
How about scrape the location of only new posts made in the last n days or n weeks?
Yes, exactly. I do not think TryNinja will be able to do that.
As there is no log that indicates which topics have been moved and when, finding out this information would require scraping all the data over and over again. I think this would be a waste of time and resources.
There's no log that indicates that a post has been edited as well, but data is scrapped anyway to show changes in the post from the archived version. Does this mean waste of resources too?
The updating could be made weekly on the new posts, since I believe new posts that are made in wrong boards could have been moved within a week by the mods.