ebay allowing customers to open INR case before delivery time expires

I posted an item to New Zealand (south Island )  sent as untracked mail item Ebay quotes the Australia post delivery time as 11-35 days for international .But after 15 days the customer opens an INR case and i  have 5 days to resolve the case !  Am i missing something ,as there been a policy change?

I tried to find why the case was allowed to be opened  with eBay but useless chat just run me around in circles .I contacted the customer to explain in a polite manner that its probably still in the post ( From past experience the NZ postal delivery  service is very slow to country areas over a month in some cases )  No Reply from my customer 

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