Bruce, you need to lodge a UPI immediately if possible, as today may have been the last day you were able to. Having said that, still give ebay a ring as they have the discretion to extend the time limit under certain circumstances.

Here is the really important and relevant stuff you need to know...

Timing is important

Be aware of the timing for resolving your case, because there are windows for when you can open and close the case and be credited for certain fees.

If you don't receive payment, you can open an unpaid item case in the Resolution Centre as early as 4 days or up until 32 days after the listing ended.

The buyer has up to 4 days to send a payment after the case is opened. During this time the buyer can also contact you to request a payment extension or make another arrangement. Of course you can agree to the buyer's request, but you're not obligated to make special arrangements.

If the buyer pays using one of eBay's approved electronic payment methods (PayPal, credit card, or Paymate), then the case closes automatically. But if they use another method, you need to go to your My eBay and mark the item as paid.

If the buyer doesn't pay, you need to manually close the case in the Resolution Centre within 36 days after the listing ended. If you haven't closed the case on the 37th day after the listing ended, eBay automatically closes it and you don't receive afinal value fee credit. Also, an unpaid item won't be recorded on the buyer's account.

Once the case is closed by you or eBay, you can't reopen it.


Opening a case

Timeline: 4 to 32 days after the listing ended

Refer to http://pages.ebay.com.au/help/sell/unpaid-items.html for more details.