The same discussion happened awhile ago, when I posted about some new Fujitsu pack. I don’t remember all the details, but you can try to look for that. Someone else said the same thing, that really “new” packs would have batteries with low voltages, and I think that I did find some website that said the same thing, but I don’t remember if it was posted on that earlier thread.
On the earlier Fujitsu pack, I was about to dump all of the gray CGR18650s until I found that info and someone posted confirming about the low voltages, so I kept all of them and charged them as I mentioned above (put them in a charger that doesn’t check for low voltage for a few minutes, then fully charge them in a normal charger), and they all work fine as of today.
If I bought a used pack, and it came out with all batteries with low-voltage, I’d be dumping them like everyone recommends, but at least personally and from my experience, new packs, if you can get some assurance that they are really new, are different.
Not recommending anything, but check the info out for yourself and decide.
EDIT: Here’s a link to one of the posts from that older thread about the Fujitsu pack: