Mac Studio Fix Fluid MC40 30ml

I recently bought a new foundation I was going to eventually need. I went into Ulta thinking I bought NC40, but instead came out with NW40. It is brand spanking new. Hasn't been opened, only for pics, unused or even swatched. It's not my color so I wanted to exchange it, but I couldn't find my receipt anymore and I was to embarrassed to exchange it. So why not sell to someone here who can possibly use it.