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Z/28's were built in both plants.
The protect-o-plate was affixed to the warranty folder; if it's not with the car, some previous owner has it (or pitched it).
There was no "Fisher door tag" - all the Fisher body build info is on the cowl tag.
If it's a Norwood car, chances of finding a Broadcast Copy are essentially zero.
There's no Chevrolet build information available for '69 Camaros, unless the car was sold new in Canada.
The cowl tag shows the original exterior color and interior trim combination, and if it's a Norwood car built after mid-December, 1968, it will also show if it was originally a Z/28.
If you can post the VIN and a photo of the cowl tag, we can help you decode it, and we MAY have some info on it IF it's in the CRG database.