Thanks for reaching out!
In order to find your previous purchases, you need to log in to your REI.com account. When you click on the 'Account' tab, you will get a drop down menu. You should see a 'Purchase History' button that will take you to your previous purchases.
If you have any further questions, you can call our sales and customer service team at 1-800-426-4840.
Hopefully this helps, thanks!