I can vaguely recall discussing this topic in another thread years back.
I’ve had a couple samples of CPCs over the years for failed projects, and I personally recall receiving my color sample and thinking..do they use reject or off spec chips to make up samples? My sample was a stack of different sizes, Amold, and I do recall being unable to remove a “gritty” or “fine sand grain” type of a feel, though I didn’t care. I sort of took the plunge into chipping in 2019 with a 700 pc CPC set, before even knowing how great they were. Sampled a barrel for one night, ordered the next day. I don’t think you are the first to feel this way or mention it. I figure in general, if I’m not totally off my rocker, and they make samples with less than par quality chips, it’s probably only us chip nerds on PCF who even give a crap enough to even notice.
I know once you receive their chips, as products, they are outstanding! Quality and durability is tops and you will love them. Don’t let it be a measurement of their end quality.