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When I choose rose gold model for example for in store pickup
That's what I get:

1.jpg
 
Look around and keep refreshing. There's still some random variants of the 6S+ around.

I remember last year, I got my AT&T 6+ at the Apple Store on launch day and the next morning, I checked Apple's site and all the local stores had gotten shipments for that Saturday. It's so random. They had all the models in stock.
 
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