Purchase Order --> Open Sales Order Report

I've just discovered that one of our purchase order has gone missing with UPS. Obviously the order will be closed, and items needed reordered. What i'd like to try to do is see if there is any way at all to get a report by PO line items or open sales orders needed these product... To allow CS to contact clients to notify of the unexpected delay. Is this at all possible, or am I wasting my time trying to get a report on this?

Thanks in advance