I always find this discussion interesting - regarding the QC of Case knives - and how much of it is based on actual QC issues - as in, defects that the company would find unacceptable if they noticed them - and how much is customer perception of what constitutes a defect.
I have probably over 100 Case knives, the majority made between 2000 and 2014 (a few older ones too) which is when I stopped buying them because I have enough. I have never had a single one that I needed to send back to the factory. Maybe I was lucky, maybe the QC fell off since 2014, or maybe I am a less discerning customer and there are things that don't bother me that do bother others.
The last batch I bought was a group of 5 I bought for myself as a late Christmas gift in Dec 2014. Out of those, I could tell (based on the condition of the paper wrapper) that the dealer had re-sold two knives that had been returned to them. I could see what what the problems were with those two and they were easily resolved. They are two of my most carried knives to this day. The other three were new-in-wrapper and were fine.
I have other Case knives that I carry that have minor gaps between the backsprings and liners and with blades not centered (I never even knew that was something I was supposed to care about until I read others' complaints - as long as the blades open and close fine I am OK with it). These things have never worried me and are well within the "QC envelope" I expect from the knives.
I look at posts complaining about something that can only be seen with high magnification, go pull out of few of my knives and look really closely, and sure enough, some of mine have that "thing" too. A knife I have used and enjoyed for years was horribly flawed all this time and I never realized it. I usually just shrug and go back to enjoying it the way I always have. Blade rub on crinked-blade knives is a prime example; 1- yes, why wouldn't there be, and 2- seems to cut stuff fine and I end up with more scratches from cutting cardboard. Again, as long as it opens and closes, and doesn't dull or damage the blade edge, good by me.
I know that Mike Latham has expressed several times an observation that pocket knife collectors have become more "picky" to use a term that sounds derogatory but I don't intend to be, and that they may be expecting a higher fit and finish from traditional pocket knives than they are realistically going to get.