Only covers up to 1981 I recall, but enough to do simple procedures. Heck, you owe it to yourself to try to arrange test drives with cars both in and out of your price range so that you get an idea of the entire range. Many are PCA members and soon 928 Owners Club members, and there are many social events where you can introduce yourself. Of course there are car specialists who can locate and broker the sale for you. This is a great way to buffer yourself from the agony of long distance searches and such, but for shoppers of the earlier models may not be financially feasible.
Clear title is presented.
Records and service documentation are present. It drives well and you check operation of all various systems and switches. Here is where the seasoned hunters and the intrepid novices oftentimes part company - and each not necessarily choosing the inspection option you'd think. Of course I'll recommend the full inspection route to all but the bravest of home mechanics or gamblers. It's your call, I understand time is of the essence some times but try not to get pressured into a sale, or over emotional during the hunt.