IMHO - A buyer should not have to anneal brand new brass. The neck area was annealed in the manufacturing process. New brass should be 'good to go'.

After a number of re-loadings, or years of aging, the case necks become 'work hardened' or more brittle (and inclined to split). Annealing remedies this situation.

A brand new bag of cartridge brass may have a few cases with the mouth area slightly pressed out-of-round or a slight 'dimple' in the case shoulder, but, these are easily corrected for use.

Occasionally, you may find one defective cartridge case, in a bag of 100, that was flawed in the manufacturing process and is scrap. (This has been my experience).

Your experience and description, of six cartridge cases (in a bag of 50) 'having pleats' in the neck area, is rare and unusual.
It suggests a problem at the factory that resulted in flawed cartridge cases and they got through, undetected.

You should inspect your second bag immediately. You should save the 'reject' cartridge cases and photograph them.

You should notify the Distributor and the Manufacturer and expect that they correct the problem! (Send photos of the damaged brass, as received).

p.s. Posted photos on the KCA Forum would be of interest to members.