BTW, I just got my batches from Office Max... one was PAPA and the other was Prodisc made.
Not sure if this applies to all packaging, but the Prodisc made box had a dark blue print whereas the CMC made PAPA were a purple shade. Neither pack had the Trial insert... although they did have some of these.
Another thing I noticed was that the tops of the spindles were slightly different. The CMC PAPA pack had a small rectangular cutout and the printing on top (LOCK, OPEN) was in Times font. On the Prodisc pack, the printing (LOCK, OPEN) was in Helvetica and there was no rectangular cutout.
This might help you to get the type of discs you want!