The discussion is not whether US Notes are lawful money, it is whether the specific code (12USC411) expressly defines USNs to be the lawful money referred to in that citation.
My initial posting on this topic was directed at doug555 who was trying to be precise with the language used on checks. Whether or not your "first-hand experience" expresses validity for you is something only you can comment on. I am merely trying to follow doug555's lead in being precise so as to form a proper record which leaves no doubt as to one's intent.
The fact remains that Robert Henry has no authority to redeem FRNs precisely because Robert Henry did not issue them. Robert Henry can only make a record of the 'demand' so as to dismiss any assumed liability for use of FRNs.
I have no authority to go to Wal-Mart, take someone's coupon and give them a product on the shelf - it's not my coupon and I didn't issue it.
Language and definitions are critical if you wish to participate in the game.