charles wrote

Ordered soemthing cheap (£3) off ebay. Wrong item
sent, so I used the ebay system to return it. Printed paid
for address label and handed it in at local post office.
I get an email to say it's been received and then I get
a refund to my credit card. Next day the packet I sent in
the post comes through my letter box marked "Gone Away".

So, they can't have received it.

They just don't distinguish between received it and cant receive it.