This is what every company I've been at does. They fire and give severance during the WARN period. Nobody will ever give you a list of who was laid off at any company I've worked at. You would just have to.. figure it out

What I meant was that I thought this information was required to be sent to the government and public via something like a FOIA request, so this was always available to anyone motivated.

My experience with how companies administer the layoffs has been the same as yours.