In the scene when Indy is opening up the package from his father, look at the rest of the mail he is holding. There are little plastic windows on the envelopes--like the kind on bills. Hello? What year is it?
Hello.....how do you know that they didn't have envelopes like that in the 40's?
They had the technology to build a nuclear bomb didn't they? What's the big deal about a little plastic window on a friggin' envelope.
Windowed envelopes did not come into wide use in the US until the 1960s, when the industry was forced to adapt to the increased use of computers to automate mail generation. Their history can be traced back to the 1950s, but they were not manufactured in any great quantity until a decade later. It is reasonable to suggest that Jones would not be receiving mail in windowed envelopes.
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