Jeff,
thank for your answer.
Regarding the marks on the package tray, I noticed that on the only original panel I own. These orignial masonite panels seem to be rare, as the trunk divider panels. It did not came fom my signature car, but was taken of a 67 San Jose fastback (build date unknow).
My research is mostly based on observation of cars listed in the internet and it does not have the scientific or methodic approach, that is usually the rule here.
The divider panel in the car with red interior is from a Metuchen 68 fastback (here again no build date).
On this picture, another example of the package tray with 2 holes from a january 8th San Jose car. Obviously no 100% original, with additional fastener and speakers. Note also, the latch cover plate without bump, that is, early style.