So, I was wondering the same thing, and I'm in the same boat as you, i.e. only received one email from Lotus Cars USA on Aug 11 '22 announcing production delays, with a 6-digit reference number at the bottom.
Well, I was at my dealership this past Saturday to check out their new demo Emira, and I asked if I they'd received any emails from Lotus indicating that they've received my order, and a number to track it with. He said that the reference number at the bottom of the Aug 11th delay announcement is my order ID.
I'm there again this Tuesday for a test drive, so maybe I'll ask him why some depositors got a "Approved entry for ID ######" email and others didn't.