@Hugo
If you are using "Sold" label of theme, it is possible to grab listings with this label.
Problem is that it is not possible to say when it was sold.
As alternative, it would be possible, to add into function that is marking item as sold update for dt_mod_date of listing and then you could use s_sold = 1, order by dt_mod_date desc, limit 10
Another issue is that for starting website it may have opposite effect if section contains still same data or just few listings.