This means that the documents that the adjudicator mentioned in the decision didn't exist, or the employer knew that you'd lose because of the late appeal and didn't bother to provide them or show up.
Your appeal notice would have had two issues listed: Timeliness and whether you quit or were discharged.
Once it was concluded that you didn't have "good cause" for the late appeal, the ALJ/hearing officer stopped taking testimony. They needed to go no further because the issue of timeliness was decided against you, and that preempted everything that followed.
If you had understood the employer's burden of proof, you wouldn't have cared about the warnings anyway. In an unemployment hearing, the last thing the claimant wants is for the employer to show up with signed written warnings. You want them to forget to bring them. You'd never want to attempt to get a subpoena for them if your state even allows it. You'd only be concerned about the documents if they were produced voluntarily, and there would have been sufficient time for you to examine them.

