1969 Dart - Holes in Door Jamb and Door Unsure if Correct?

I looked at a 69 Dart Swinger that was recently restored and there were was a hole in the door jamb that I never seen before. It's closer to the top of the door jamb (just below A-Pillar). I checked my 69 Dart and there are no holes that high above the door switch. Any thoughts?

There is also a hole in both doors above the latch that does not have a plug. My Dart also has the holes and not plugged off. Any thoughts what type of plug?

As for the holes in the door jamb, back in the day that's how we ran speaker wires to doors. The hole in door by latch most likely lines up to window track bolt.

Possibly rustproofing holes or maybe a "Dent Wizard"s" access holes???

Joe