Well I did some cusory research and found this
I noticed they don't have the same guarantee for the wonderful ones as with the everybodys nuts. Maybe they were using only the biggest sized pistachios for those ones and knew they'd all be opened no matter what, so they could guarantee it, and the wonderful ones are either artificially opened or a lower grade. Costco usually picks the best quality of something too, and I haven't checked but I don't know if they carry those or not. I wonder where their Kirkland signature pistachios come from