None of the stuff listed is in any way illegal. Likely find a lot of similar stuff in the closets and safes of many freepers. Any idea what type of flight manuals were found? Airliner or Cessna? It matters. If you are a convicted felon, then many items that are perfectly legal to possess for normal people are prohibited. Firearms, ammunition and bullet proof vests are specifically illegal for a convicted felon to possess.
Important piece of info that escaped me! A convicted felon indeed would be prohibited from possessing many of those items.