Ok, I've invented a time machine. However, I did something very silly; the blueprints are glued to the side of it. So I can only use it once, and cant make a new one. It only goes backwards, but goes backwards to any date you want. It has dimensions of 2m*2m*2m, and I've decided to send it back to December 7, 1939, where it will cleverly drop boxes into the US Postal System, to be mailed anywhere in the world. So, my question for you, my only friends the most historically knowledgeable people I know is, what should I send, and where should I send it? Also, can you recommend a better date?
Here's the trick. The only thing I know about the conditions during the trip are that the temperature will be below 500 degrees and will be one month long. The temperature may be high enough to incinerate books, so please select a fireproof option in addition to a book, if you choose a book.
I want to send the breech assembly of the Bofors L/70. Also, a round of APFSDS ammunition (excluding propellants) to the US War Department.
