Then be sure to say "New-in sealed box" however you decide to peddle it. You can use the stock Lenovo photos when advertising it rather than opening it and taking your own. That seal matters with electronics, especially for something as pricy as that. If you go the ebay route be sure to consider ebay and paypal charges when setting your price.
I was going to ask if the French used Craigslist but I found you have something more popular called LeBonCoin. You might consider that, too.
While I have sold on Ebay before, I always try FB Marketplace or Craigslist first because you don't encounter all the charges Ebay/Paypal gig you with. If you sell it and have to ship it, the other party can send you payment thru Paypal "friends and family" and there is no fee, or use any other online method you choose.. Most of my Marketplace or Caigslist sales have been fo used items and the buyers close enough that we met, they examined the item, and payment was cash in hand. But keep in mind once that seal is broken it takes dollars (guess I should say francs) out of your pocket if they change their mind. Best of luck.