Re: the initial ten-dollar payment....
Why would there be any "Post Office record" of that $10 cash payment that Oswald mailed directly to Seaport Traders?
Please explain why you think the post office would have even SEEN that $10 CASH payment sent by LHO. It was inside an envelope all the way from Dallas to Los Angeles.
Why would there be any "Post Office record" of that $10 cash payment that Oswald mailed directly to Seaport Traders? There wouldn't be, but what about the balance of $19.95 to be paid (C.O.D) at the collection of the package?
How did that money (if it was ever collected) get to Seaport and where is the paper trail for it?