Seeberg used to use those fuses with integral caps. That is one of those fuses with a breaker wired in. I haven't used it in years. I still have a bunch of the red cap fuses.
I bet you figured out the other stuff mostly.
The large jones plug with 120v and two bananas for 6vac. That is for Seeburg tube chassis amps.
The dual pot with a molex is for later SS Seeburg amps volume control.
The giant resistor with clip leads - I use that in place of the field coil in electromagnet speakers.
I forget what else I sent.