Hello 'chasjonson',
You can't, not on ebay. You can only view the last 3 years' worth.
To do that, go to your Purchase History, and under the Purchases bar
click on the word Archived.
Below that where it says Period, this will show you what is available for viewing.
If, however, you have a paypal account, you can go to the Transaction History and
see ever item you've ever bought.
Otherwise, if you have saved the receipts in your regular email somewhere, that may
be a possibility. Or if you use a credit card and still have all the statements...