It is a new one to me, thanks for posting it!
What is the VIN of the car it was found in? (email if you like) If I know of one for your car I will let you know.
Some cars have 5 sheets in them.
When the cars were built, broadcast sheets were printed out in ALL the sub-assembly areas in the plant at the same time. Similar to a radio 'broadcast' except that everyone got a copy intead of listening to it. So, each car may have had 80-100 sheets printed for it originally.
As far as the broadcast sheets in the seats go, they ended up in the wrong cars at times because once the seat was built that broadcast sheets job was done. The trim shop built the seats & forwarded them to the main assembly line. The people there just grabbed a seat the right style & color for the car & bolted it in.
If you have not searched EVERYWHERE, please do so now. If you find any more sheets to other cars, please report them too. It really helps guys like me figure out how the plants were run since cars were often built WAY out of VIN order. I have broadcast sheet info on file for a few cars built one right after the other, but the VINs are thousands apart & the scheduled production dates are weeks off.
List of places to look;
Taped to the back side / top of the glove box insert.
Under the front bucket seats in the springs
Inside the bucket seat backs
Under the rear seat bottom
In the rear seat back.
Under the package tray(speaker shelf)
Under the carpet
If you want to send the original in, I can list it on the site with the others & hope the owner of the cars sees it & claims it. If you want to keep it I would appreciate a scan of it for my records please?
Barry