You can't. What if two people choose the same item and you have only one to send?
The unhappy buyer can leave negative feedback, trash your DSRs, and give you a black mark on your selling record.
Since your first 50 auctions are free, just list each item separately. You can mention in your description that you are breaking up a series and that other parts of the series are offered separately. You can also offer combined shipping to further entice multiple purchases.
BTW, these items can be scanned on a flat bed scanner more easily than they can be photographed. Scans are also easier to enlarge to show detail.
