OK, so I am good to go either way. I guess I'm just naturally paranoid. I think maybe the person who said "do you think he can tell?" in (perhaps not) reference to me may have been talking about a swap of my new phone or my old computer, again making no sense. So it's just me being paranoid. Thank you for the response and the vote of confidence!
That would be a strange thing to do. Considering a UM2 upgraded with the extrusion kit effectively makes it UM2+, not really any lesser than a UM2 upgraded to +. So if someone DID do that, rest assured you'd have ended up with a UM2+ either way.
Now if you really wanted to know for sure, you can always check the serial number sticker on the bottom of your machine and on the box and cross reference them somehow.
Either way, I would probably not trade in a perfectly good 2+ for a dual 2, unless it happened to be Foehnsturm's UM. You're just asking for reliability issues, and reliability is where UM2's really shine.
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