I think Coinabul should send back 100% to the buyer since he shouldn't want to be a dip shit like USPS.

Let's take a hypothetical situation:

I sell something on eBay and decide to deliver it to the buyer by car. The buyer paid me for the product and gas in advance.
During the journey I decide to go get something to eat and park the car on a restaurant parking.
Some dip shit thief decides he likes my car and wants it so much he steals it while I take a shit after those delivious roasted ribs.
FFFFFFFFUUUUUU, I was supposed to deliver the thing to that guy. What should I do?

How do I prove that the theft was not set up?
How can Coinabul prove that he didn't tip the delivering company about the silver so that they can pretend it got lost and share the profits?
There is a potential for abuse in both situations, if the seller assumes responsibility as it should be, he has no incentive whatsoever to try and scam the buyer.
Otherwise I can give the 2nd car key to a friend and ask him to 'steal' it, whereas Coinabul can keep the silver and the money, at the same time maintaining an alibi because he has a tracking number.

If my car's insurance also covered whatever's inside the car I can file a claim but meanwhile I should take the responsibility for leaving the car and choosing my insurance company (in case they would try to avoid paying) and return the rightfully owned money to the buyer due to being unable to provide the delivery of the product that was promised.