I’m 45 years old and I carried my grandfathers old Winchester model 97 trench gun he had to school to show in a war and armaments class I elected to take in 7th grade. I didn’t have a case so I wrapped it in a sheet, handed it to the bus driver then took it in and handed it to the teacher before my fist class started. Brought it home the same way, and this was in Brighton Michigan, not exactly a backwater rural area. If my son did the exact same thing on the same bus route now I’m thinking they would call out a SWAT team to deal with him.
As you said, today this would bring out the SWAT teams....
We dissembled and assembled an AR-15 for a school speech class in HS. No problem for anybody and that was in Chicago.