Scott,
The best way to get a "receipt" is to write a letter to BLM (I always certify important correspondence to them) and in the letter explain what you have given them or discussed with them, then ask for their confirmation of receipt or their understanding of the conversation. The letter they will return to you can act as a receipt and certainly creates a paper trail. We (USA-ALL) and BRC are always encouraging people to do this but they rarely do. Another method for ensuring receipt is to have multiple sources submit your data USA-ALL and BRC share comments and other communications to BLM for this exact reason. I already mentioned sending info via certified mail, this won't prove exactly what you sent, but it helps and I believe the agency also treats the information more seriously because they can tell you care enough to certify the letter.
All of these things I just explained, the questions you have, and the knowledge you have are all reasons USA-ALL will be holding a series of meetings to bring clubs and associations together on a regular basis. We need to support each other more to prevent this stuff from happening.
(not to hijack your thread, but did you ever get with Rex or Dave? I haven't heard if you want us to schedule a mtg with Director Sierra or not. Let me know. Call me with your cell number I only have your home.)