Have them change your oil again? I would not risk driving around until an oil sample gets sent back weeks later.
At my 1200 service my invoice stated the correct oil was put in. But I changed the oil again myself at 1300 miles just to make sure the correct oil was put it. I have a hard time believing stealerships.
I also have major OCD with this car.
Oil came out very clean (as it should), so I gave it to my friend to use.