Bought a used Mavic Pro for $700

Hello seems like the original owner bought it 2017, and since hasn’t used it much and has been trying to get rid of it. I bought it off of him for $700. Checked the battery cycles and it’s only been charged 6 times. Everything seems to be in working order.What else should I check for?I want to register it and factory reset the drone as if it were brand new, how do I go about doing that? via /r/drones https://ift.tt/2LmB2bI