70 SS Body Tag, Vin Plate, Firewall Stamp Question

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Here is a pic of the stamping on the firewall taken from the engine compartment side of the firewall. The blower motor opening is partially visible in the upper right corner to provide perspective to the location.

Over the entire firewall front surface I have not found a "hidden VIN."

I have a 1969 ex-drag V8 Chevelle (now pro street) in my garage and the hidden vin is clearly visible and reads K9 and the last 6 digits of the vin... I found it under the blower motor area. Inner fenders, blower housing etc. are obviously not intact.

I guess that is why they call it a hidden vin and not a hidden body code.

Thanks for your help so far understanding the body code type stamping on the firewall.

Should I expect to find a hidden VIN somewhere else or could GM have missed stamping this unit? I did not find a stamp near the gas tank filler recess on the rear of the body as suggested in a previous post.

Thanks again for all of your help.