SpringbokDreamer:
You possibly know that the DC-3 cockpit has two sliding windows, one for the captain and one for the first oficer. Each window can be slid back to let in cool air or in the name of cockpit tidiness to allow unwanted rubbish to be tossed overboard. I personally saw (at various times) the likes of half eaten sandwiches, orange peels, apple cores, empty cigarette packets, newspapers, a uniform cap, cardboard lunch boxes, duplicated forms and best of all a perfectly good shirt that had lipstick marks on the collar (too risky to take home) all go out the windows.
I'd say it's a fair bet that a DC-3 or similar unpressurised aircraft simply jettisoned the form 2408A your uncle found.
I suppose I should clarify the tossings out I was involved with by telling you it all fell into the jungles of Malaya, the Malacca Straits or the South China Sea. This however does not alter the fact that out the window it went. Thanks for reminding me of it.
Regards,
828a