Ebay buyer didn't receive package (SAL) and threw out the receipt?help?!!?

Okay, first off, you have to treat selling on ebay as a business. This means good bookkeeping, and that includes holding on to paperwork, especially receipts. I keep mine for one year in a filing cabinet by month sold. If you have a record of your payment for the shipping, it may be able to be traced by the postal service by the date and payment. That is something you will have to look up and then go to the postal center to check on.