Pete In my case I was the shipper. I shipped a customer a $3500 propeller I forgot to add the insurance and UPS lost it. How you lose a 120Lb prop is beyond me but that’s what happened. So I shipped the customer another prop no charge UPS eventually gave me the $1000 included insurance I licked my wounds and called it a day.
There is no mystery here the builder is responsible. Ask him how he would react if you shipped the engine un insured and it got lost on the way to his shop and you were expecting him to pay for it?