Buying Used Still in the box

Quick question for those that are experienced. I’ve got a guy in my area selling an X-50 that he purchased in Oct-2022 but says he never did anything with it. It’s still in the boxes.

Is there anything I should be concerned with buying from him? I realize the warranty would have expired but seems strange someone would spend all that money just to store it and never even set it up.

Any help on what I should look for when I go take a look at it would be most appreciated.

Considering the controller is a $500 replacement, sometime saving $500 ends up costing more in the long run.