The main issue was we moved all old content from both wanted and for sale, and parts and vehicles into one big archive which wasn't a good idea. I'm sure Andy will post an update if/when they can implement something different, like a sold flag. But I know they are looking into it.
To be fair, if we moved sold items to another forum but kept the same breakdown, you could still easily search across either or both together using the advanced search feature. So IMO, the only downside to multiple "Sold" archives would be just that - a proliferation of forums, but otherwise I think it would be fine. I am sure if people didn't mark them as sold, one of the moderators would see them or horsey would alert us. Maybe we'll make horsey a mod or something