I've been victimized in the opposite direction.
I occasionally shed some kits on auction to manage the herd. I once completed a sale for a sealed Tamiya kit, only to have the buyer report me to the site when he opened the shrink wrap to "find" that there was no body shell in the box. Obviously Tamiya quality control has never let a kit go out the door with every part but the body, clearly I was being scammed, but the auction site will instantly believe the buyer who claims to be a victim and I was required to issue a full refund (plus shipping). I lost the kit and I even lost additional money on the transaction fees.
I will still auction off kits on occasion to cull the herd, but I will never again sell one with the contents sealed, it's trivially easy for an unethical buyer to basically steal it from you, since you have no way of proving that the contents of what you are selling are full and complete. And "no refund" or even "as is" declarations don't work if the buyer claims the product was misrepresented.
(I am aware that Tamiya does not typically shrink wrap their kits, but these were sourced brand new from HLJ, an extremely reputable retailer, so if they were not shrink wrapped at the factory they were sealed in the retail chain, not by another consumer. No difference to me either way - if there was no body in the box then I paid for junk from HLJ (doubtful), if there was I got scammed out of it at auction. Being sealed prevented me from knowing either way.)