It's pretty hard to sell a bike now unless you want to discount it a lot now. Your nephew is going to be very happy with that bike. Lucky guy!
I just bought that exact bike a few months ago. The photo and description showed GRX crankset. When I went to the store a some bikes had FSA and other had GRX off course the color and size I wanted had the FSA. I asked them to swap with one of the other bikes. I got some push back but they did swap it out for me in the end.