Are you tracking the whole message or just the ID? You can track just the by making it a promoted property… In any event, I think you’d need a custom query into the tracking database. I think you can use WMI – but that’s a little hard to work this.
I’d probably dig into the SQL tables in the tracking DB and see what tables I needed. Just make sure you are careful with the queries – read the blog post on Message Box Queries on the BizTalk Server Team blog for more details.
Hope this helps.