Restoration of burnish brown RS COPO

[bergy]

Well - I've started a thread to follow the restoration process on my latest project. The prior history of this car is on this site under "copo on ebay". As I was disassembling the car today I ran into a couple of things that I haven't seen before. Maybe someone out there could give me some insight. First, the interior heater box has an orange "30" marked on it - any significance? Second - when I removed the funky old brown plush carpet (very 60s) from the package tray cover, I found that the original package tray cover (still under the funky piece of carpet) has factory speaker holes in it. I've attached photos. Does this just look like AM rear speakers, AM/FM, or can't tell for sure? The car did have aftermarket Jensen speaker covers attached to the funky brown carpet - no sign of any speakers though. If anyone has any input, please feel free to post. Thanks, bruce