Somehow I don't think these shotguns are going to be stored at any school.
This bid request is from the US DoE, not from the State Dept of Ed or Chicago DoE. mY guess thses weapons are for the defense of the Fed offices.
I don't think shotguns would be ideal for use in a school either, given the potential for calateral injury in a crowded area due to the wide shot pattern of buckshot at distance. Unless non-lethal bean bags were to be used.