finding tracking number past 60 days

[antiqueconnect]

a buyer just opened a case for an item he won on 2/12.  He writes that the tracking has not moved since sometime in Feb.  He is in Australia.  Because the auction ended past 60 days, I can not locate the tracking number in my sold items list.

Two questions:  where can I find the tracking number?   Is there any time frame limitation as to when a buyer can open a case for item not received?

Thanks for any help!