You're probably right. I suspected they took stock that Celine had decided to not put on their shelves because it didn't pass their quality assurance process.Unfortunately I can't see their bags in person easily as I'm in Perth
Maybe the reason why they can sell at a bit of a discount is because the quality is lesser? I've read that they go on 'buying trips' to Paris etc. - maybe some of the bags they pick up are leftover stock that doesn't get sold over there because of quality issues...
When my friend got the smooth micro bag, the bag was so wrinkled and there was a visible scratch on the the back. She wanted get a refund but they would only exchange it or give her a credit for it. I should've learnt my lesson then... too late now.
I hope you can get your hands on a nano soon! It's very functional and super cute!!