seller wont reply, can't return item to PO box, ebay says I have to return the item???

[woldiet]

I'm trying to return an item to the seller as it doesn't fit, and the seller will not reply to my messages. I contacted Ebay who informs me I have to return the item. I tried to return the item with a courier but they have all stated that they will not deliver to a PO box, and the only address I have is a PO box in Chullora NSW. Ebay has said they cannot give me another address. What can I do now? 

[sandypebbles]

woldiet  'Nobody seems to listen'

That is exactly what I said in my reply, if you care to read it

You also declined to answer if this was the seller in China with the horrid feedback you opted to buy from, so pretty much confirms yes it was