This is very odd indeed. When did you receive yours? Mine was shipped on June 27th and landed on July 2nd. The black fold-over "Designed by Apple in California" box with the decals and such is die cut to accommodate the Ethernet adapter and the black plastic tray the Mac sits in has been extruded with an opening deep enough to accommodate the thicker box.
I'd be curious to know if yours was shipped before or after mine.
I purchased it on June 21st at a Best Buy in Charlotte. Mine is the base model.
You know it is possible that you accidentally received a retina that had the adapter added as an option and included in the shipment of your Retina.
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