OK just an update to share: I called back to AGR last week and tried a couple different agents, but all said that the posting date was correct and would not switch. When I explained that according to the double point promo terms it was based on travel not purchase, that their agent had previously confirmed that it was an eligible trip, and that when I traveled on the pass last year the points were awarded on the date of first travel they still wouldn't budge. I asked how the customer would find out about these unique posting rules and they said that the rules were written in an employee wiki, but there wasn't anything available to the general public. However they still wouldn't budge, so I asked to speak to a supervisor who said that the rules were the rules regardless of what is available to the public, how the terms are worded, or what a previous agent had confirmed. Anyway, long story short the supervisor said he couldn't do anything anyway and that he would have to check with his supervisor whom I couldn't talk directly to. In the end I got a call back today saying that they would award the points, but it would be a one shot deal - seems fair to me. The frontline agents (Jose, Craig & Cindy) were all great and professional; the supervisor... meh... So, just a heads up about the posting dates if you plan on using a USA rail pass.