Hi mariancoley,
Welcome to the Community Forum!
When PayPal is not notified that one of your buyers has opened a non-receipt claim, we typically ask you to supply tracking information as evidence that you have sent the item.
If you have used a trackable service, this can be found on your postage receipt and is normally called the barcode number.
If you have not used a trackable service and can only supply a postage receipt, enter this as a response within the text box in the resolution centre.
I hope this helps,
Conor
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