Hi all! Long time lurker here, but first time poster.
I am slowly building my Chanel collection. My husband purchased a GST for me a couple of years ago, and I added a M/L Classic Flap last year.

A new Costco just opened yesterday in a affluent suburb outside of Houston, and there was a JUMBO CLASSIC FLAP there last night for $4200. I couldn't believe my eyes. There was just one, so we purchased it. The question of authenticity honestly did not even cross my mind. I've purchased a Burberry at Costco before, and it's 100% authentic. They sell a lot of high dollar items, and they have a great return policy, so I don't think I have anything to lose. I have no idea where they acquired it, I was told that they usually try to get a few special items for each Costco grand opening, and I guess I just happened to be present at the right time to snag it.
After I got home, I compared it to my M/L flap (purchased from Neiman Marcus), and I have no doubts about the authenticity - all the little details check out! I attached a picture I snapped in the store when it was on display.
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