There are two ways. First, you may look up
orders on the WGA Order History tool. You will only be able to view orders
through this interface if you entered your Wharton username or Wharton e-mail
address when placing the order. The functionality can be accessed by using the
following link:
https://appsmx.wharton.upenn.edu/authenticate/inside/login.cfm?URI=http://wga.wharton.upenn.edu/wgastore/user_results.php
Second, if you set up your Yahoo! Wallet, you can view past purchases made on the WGA Store, provided you were signed in when you made the purchase (which is required to apply your stored information). Go to http://shopping.yahoo.com/store/order-status.html for more information.
NOTE: You will not be prompted to sign-in when you access the order-status page directly. There is a link at the top center of the page which allows you to sign-in.