Stick a mobile number in a high value ad, if a buyer puts a serious offer in ask them to text an email address to that mobile number (cos ebay blocks email addresses in their stupid message system) and send the buyer an invoice for the agreed amount. The buyer still has ‘protection’ by using paypal and you get to circumvent a 10%-sized bending over from ebay 😀 I’ve sold a few high(ish) value motorcycle parts this way recently. Obviously this needs the buyer to agree to purchase off ebay first, but you can make it more agreeable by offering to split the saving on the final value fee.
I always make sure I take good photos before, during and after packaging a high value item and email the buyer the photos to cover myself against possible ’empty box’ scams.
edit- dunno how offering to go halves on the saving by selling outside ebay could be considered ‘fraud’, like 😕