I qualify under their rules, so why would I need an agent?
Sorry, yes, non-immigrant 'O', retirement.
I try not to throw any paperwork away and there's a filing cabinet in our bedroom to prove it. But COYR indeed.
The IO keeps the copy of the receipt and attaches it to the res of your paperwork, the original blue flimsy is now stapled in my passport. That's a first.
I suspect the TM30 claim was so the IO found something. As I said, it was dated Nov 2018 and I haven't left the country nor moved address since then.