For now, I am bracketing the issue of the meaning of the "12" that appears after the city and state on the postmark on the envelope to Klein's. I do not buy the theory that it is the number of the cancelling machine that processed it. That makes no sense to me at all, especially since some postmarks show a number-letter instead of just a number, and I don't think any such machines would have ID numbers of 3A, 3B, etc. For that matter, I've never heard of any kind of a machine being given a number/number-letter ID of just two characters.
I have confirmed from USPS sites that when zip codes were implemented in April 1963, they were placed after the city and state in the postmark, so it makes sense to me that postal zones would have been the logical predecessor that was placed after the city and state before then. However, I cannot account for the 2B entry on Johnson Exhibit 17. I finally found a 1963 postal zone chart for Dallas, and it shows no number-letter zones, only numbers. I can imagine a scenario where a large/busy zone was administratively divided into, say, 2A and 2B, but I can't find any evidence of this.
In any case, I think the attempts to explain away Oswald's Jaggars-Stovall timesheet are unconvincing and implausible, given the nature of Oswald's job there and given the WC testimony about Oswald's work environment. I think his timesheet proves he did not buy the money order.
I also think that the evidence that the money order was not cashed is compelling. The idea that any money order in 1963 could have gone through a major bank and the Federal Reserve System and ended up in Virginia without a single stamp/mark/notation that it was cashed is far fetched, just unbelievable.
I think David Josephs has answered all of David Von Pein's arguments regarding the money order.
The deposit statement that Klein's submitted to the WC to try to establish that the money order had been deposited is not credible and is more evidence of fraud.
Beyond this, if you take a step back and look at this logically, the rifle-purchase evidence is far too pat and far too implausible to take seriously from the outset. Oswald was many things, but he most certainly was not stupid. Yet, we are asked to believe that Oswald was so utterly brain-dead that, instead of just buying a rifle at a local gun store in Dallas, he left a glaring paper trail straight back to himself by ordering a rifle by mail with a postal money order and using a false name, and then shot Kennedy while carrying a fake ID card in the same name he had used to order the rifle and never bothered to discard the fake ID before he was arrested. I mean, come on. . . .