I think I've figured out the match case entry by the FBI. If you purchase a match case* then there is a highly likely chance that you already have everything else in terms of kit stashed away i.e. 'Match case' equates 'Terrorist or Insurgent'.
*Note - This conclusion is reached after exhaustive BOB Youtube research...
It seems to me like their list should be fairly useless and filled with too many false positives to be of any value.
I don't think that purchasing any of the items in bulk from the listed kit is a trigger to initiate an FBI investigation but just to add data to generate a record on the FBI database to data mine in the future. Although saying that, the keyword 'Tripwire' is mentioned at the bottom of the document when calling the local FBI office (threat fusion centre??) to report suspicious purchasing activity.
But again criteria labels and tags on the FBI database can lead to some severe consequences as in the Ruby Ridge debacle.
Edit - it appears that the reporting of suspicious purchasing activity is sent to a Joint Reserve Intelligence Centre JRIC, which is a Dept of Defense (DoD) organisation with some centres being managed by U.S. Army's Training and Doctrine Command, Intelligence Support Activity (TRISA)
So not even a civil criminal organisation data gathering operation (FBI) but an internal military security and intelligence gathering organisation. NORTHCOM perhaps??