We just picked up our MS last week and noticed the same 50 on our paperwork when we got home. We remember during our orientation that our DS had said we had 5 miles on it. We thought maybe it was a typo and actually mentioned this to Telsa's customer service when we called them about activating the mobile app. Seeing this thread and all the replies, I guess it's typical, probably to cover any test drives they might have to do.
Avesraggiana we too had dropped our car off immediately after delivery for FPP and when we got the mobile app activated, checked the car and saw it only had 13 miles on it, which matched up to our calculations driving from Tesla. We were so excited about getting the car that when we got home we realized we had never checked the mileage or the software version. Looks like we have the current version, so nothing to have pushed right now, so happy about that.