Used Drone verses a Refurbished Drone…
If you are looking at a used Drone, make sure the seller brings the their Flying device (phone or tablet) if needed (depending on type of controller), you will want to view the Apps Menus and the seller's Profile… Tell them to make sure they know their DJI Account email and password so they can unbind the drone if you buy it… Tell them you wil also want to fly it so the controller's and the Drone's batteries need to be charged…
With that being meet, the Used Drones history is sketchy at best. You have only the seller's word at face value. Ask him why they are selling it, ask them about the flight history, how far, how often where it is normally flown. The purpose of this is to establish the veracity of what they say… Once you check their App, a lot of this will be verified or not…
Visually scan every inch of the drone, looking for cracks, scratches, marks, dents, scrapes. Look over the gimbal very carefully, looking for dirt debris, etc… Open and close the arms several times, the feel should be smooth and noiseless. Rotate the motors, they should feel and sound relatively the same. Now, you can check the Drone's serial number looking for “S” or “R” in the fifth character (if so, it is already a Refurbished Drone…). Not a bad thing, but it's bargaining position…
Now the Controller, give it the same visual treatment. Does it act normally when turned on, look for dings, dent, scuffs, dirt. Turning on the controller, you can check the number of the batteries' charge cycles (Safety, Battery Info…), you can look at the seller's profile and get an idea or the Flight Time and Flight Distance (Profile, Flight Management…), you can view the past Flight Records and view the type of flights that the seller normally flies (Profile, More…).
If you are still interested, fly the drone, you are not a newbie, you know how it should react… Try not to go swimming with this one too… The old adage applies, "It's nice to handle, it's nice to hold, if you break it, it's marked SOLD…"
If you are still interested, remember this, the one who cares the least wins. Meaning if the seller wants to sell it more than you want to buy it, you'll get t better price. But if you fall in love with it and you want to buy it more than the seller wants to sell it, you'll pay more…
Now, before any cash is transferred, you get that seller to unbind the drone from their account… It's a two-step process and the video below shows you how…
If you decide to buy a Refurbished Drone, you get a drone with the same warranty and guarantee as a new one and most are said to be indistinguishable from a brand new one…
It'a all on you and you have to decide…
Good Luck!