1972 VIN stamp, casting numbers, and date code location help needed

[kna4977]

I've been out of this loop for some time and when I was in it before these vehicles were much less valuable so numbers didn't matter all that much.

I'm looking at what is claimed to be an all original survivor 1972 Blazer CST 4x4 350 automatic.

I'm aware of the SPID inside the glovebox, driver's door decal and I believe there is a metal plate riveted to the door jamb on the driver's side IIRC.

Are there other places to look and if so where? Did they have cowl, buck tags or anything like that?

Did GM VIN stamp the engines and transmissions on these and if so where would those stamps be located?

Did they have build sheets or tank stickers and if so where were they typically located?

Date codes and/or casting numbers on major components where would they be located (engine, transmission, rear axle, transfer case etc.)

Glass is usually etched, how can I verify if it's original or not? Not sure who GM used then but I think LOF or PPG possibly others?? If I know what logo to look for I can decipher the date code(s)

Thanks in advance for any help.