Could this give some insight into why there's no pattern 49 diffractors?
http://www.ebay.com/itm/RARE-RARE-ERROR-IVAN-RODRIGUEZ-LARRY-WALKER-Topps-Tek-LOOK-/272513822724
I know the card isn't a diffractor, but it is a pattern 49 error. Perhaps the printing run went afoul during the pattern 49s and they were mostly trashed, diffractors included? Just guessing off the top of my head.
http://www.ebay.com/itm/RARE-RARE-ERROR-IVAN-RODRIGUEZ-LARRY-WALKER-Topps-Tek-LOOK-/272513822724
I know the card isn't a diffractor, but it is a pattern 49 error. Perhaps the printing run went afoul during the pattern 49s and they were mostly trashed, diffractors included? Just guessing off the top of my head.