We are, right now, as we speak, rebuilding a mission database of (most of) the golden oldies. Soon, you will be able to access a separate forum to get at them, and later, a 'proper' mission depot with search facilities. Right now, our priority is to give you access to the very missions you are talking about. This, is taking us a little time because (as you can appreciate) there is so much else to do, and each of these missions have to be individually uploaded by staff because the GreatCrash erased them (and our backups).
In the meantime, there's plenty of stuff in the Beta, a great deal of it was ultimately passed through to the Mission Depot. You can gain acesss that way, and the hunt, is often fun.