I'm sure they put in factory parts. Carmax is notorious for selling/buying cars in original condition trim. I tried selling my 2002 Frontier pickup to them which was in perfect shape, and they dinged my $700 for having non-factory sized tires on it. They told me that they have to restore any car they buy to original factory condition before they can sell it, especially if its still under factory warranty. Just for piece of mind ask for a copy of the service invoce to make sure.
Jeff
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