I have sold lots of high value Apple items and a designer bag and watch on eBay.
Years ago I was scammed, exactly the way you mentioned. Sold a Nokia phone, one of the first smart phones, for £250. Buyer didn't have a long feedback rating, new member. Paid by PayPal immediately and i sent it by Special Delivery, so all insured and tracked. Buyer received the phone, contacted me and said it was a blocked phone (which is what happened when someone reports a stolen phone). It definitely wasn't but the buyer asked for a refund. I said I wanted the phone back first, as I didn't want any bother. They sent me back my box with a phone which was the same model but different serial number and blocked, so probably stolen. I spent hours on to eBay and PayPal but they refunded the buyer and I lost out.
So now on listings I include photos of every serial number on the item and on the box. I also mention in the description that I have done so to prevent any fraudulent returns. I believe you can also block bidders or buyers with less than a feedback rating of 1, or you used to be able to do so.
My husband has asked me to sell a £2500 watch on eBay and to be honest I'm very reluctant, as I know in the case of any disputes eBay always side with buyers.
Hope that may help. Also if it's a good brand laptop, such as Apple, I use Gumtree now. I find they go for slightly less but eBay have extortionate fees now so it balances out. Gumtree does seem to attract a few idiots offering silly money, but it's pretty easy to weed them out when they message you. Also if you use Gumtree DO NOT post the laptop out. Always get cash on collection.