I didn't think that a guest could leave feedback either but apparently they can.
If you bought an item as a guest, you'll need to sign in as a guest user to view your order details. Follow these steps:
- If you're signed in to eBay, sign out to avoid any error messages.
- Find your eBay guest order confirmation email—the subject line starts with "Guest Order."
- Select View order details in the email.
- Enter your email address and access code to sign in as a guest user.
- From Order details you can choose to contact the seller, leave feedback, or return the item
If the poster didn't associate their new user account with the guest account that might explain why they are having problems
accessing purchase information.
- If you're signed in to eBay, sign out to avoid any error messages.
- Find your eBay guest order confirmation email—the subject line starts with "Guest Order."
- Select View order details in the email.
- Enter your email address and access code to sign in as a guest user.
- Select Leave feedback or Sell this item in the Order details page. You won't have to complete either action, but it'll allow you to register for an eBay account.
- Enter an email address, create a password, and then select Register. If you use an email already linked with an account, you'll need to start the process again with another email address.
Once you confirm your account, the item you bought as a guest user will show up in your eBay purchase history.