I think I'd be taking it up with the postal service that was used if it's believed that damage was caused by them. Even when well packaged its no guarantee against any harm coming to an item. Was the packaging damaged in any way? Does the machine bare any signs of being miss-handled? Even if there are no outward signs, something inside may have jarred/moved. If there's any reason to suspect damage in transit then put in a claim. Follow the guidelines from the postal service on how to proceed. @Coffeebean on here is a Fracino man and may be able to provide answers to what could be wrong, or who to contact to take a look at it for example.
I personally don't trust postal services, especially after having one grinder arrived with its base cracked and the grinder out of alignment from being dropped. When I bought my EK it was on the understanding that I took full responsibility from the time it left the seller.. that was a nervous few days..
The transaction appears to have been carried out in good faith from what I can see there's no reason to say otherwise. Unfortunately from our perspective, once a sale has been agreed it's out of our hands and the dispute lies between the seller, buyer and the postal company. Maybe @Glenn can confirm that and offer further advice? I can understand how it can be frustrating for both parties involved.