Buyer has filed and closed a INR case but now has open an Item Missing Parts Case

[johvilled-0]

Hi all,

Weeks ago a buyer opened a Item Not Received case due to a delay in shipment.  The matter was resolved when I provided tracking info and the buyer contacted USPS, with USPS letting them know there is a delay in shipment.  

Now, after still not receiving the item, the buyer has opened a missing parts case. 

I am not sure how to proceed since this is not a INR case. 

Any advice would be great.

Thanks

[donsdetour]

A bit of a problem if they still have not received item. But they actually may have and not scan.

What part do they say is missing?

[johvilled-0]

In the seller's message they state item was never delivered and it's not at the post office.  I did a trace today at USPS and the  last known scan was in Missouri and in transit to next facility. 

I know eBay normally sides with there seller on Missing parts cases is I'm trying to figure out what is best.