You misunderstand me on number 2.
During a period of time, Omega used to exchange movements at service, then service the movement they’d taken from one watch, and put it back into another watch at a later date. You’d get your watch back with a serviced movement in - just not the one it left the factory with.
As
@flqt-9000 sats, a production year, and a sale year, are not necessarily the same thing - I have watches with a 5 year gap between production by Omega (as indicated by an extract of the archives) and sale by a retailer (as shown on papers that came with the watches).
As long as you weren’t charged a premium for the papers I don’t see it matters hugely - I’m always a buyer for a watch - anything that comes with it is just sprinkles or a cherry on top!
congrats on your pickup.