Is your Purchases list set up for the longest possible period?
Since you probably paid through Paypal, have you looked on that account for the payment. The Details link will show you the listing for about 90 days.
You only have 45 days to file an Item Not Received claim.
Do it now.
If too much time has passed you can still go to the credit card that PP processed for your payment and ask for a chargeback.