An agreed return parcel has gone missing - what do I do?

I agreed a return and via ebay sent a return address label.  I haven't received the parcel although ebay say that Royalmail tracking says that I have received it.  What do I do?  Whose responsibility is it?  help please - ebay give no guidance

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Is your Ebay-registered address up to date...? I ask, as sellers not updating their addresses when they move home seems to be quite a common problem.

 

But whatever the problem, you will have to refund the buyer. If you don't, Ebay will force the refund, and slap a damaging defect on your account for not refunding voluntarily. You will then have to contact Royal Mail to find out where they left the package, just as a buyer would if a package you sent to them had tracking proving delivery. If Royal Mail have misdelivered (it happens) and can't retrieve the package, they, Royal Mail, will have to compensate you.

 

@castellane1